Sexually Transmitted Diseases (STDs) or Sexually Transmitted Infections (STIs) or Venereal Diseases: Causes, Symptoms, Prevention, and Treatment (May 2025):

 

Sexually Transmitted Diseases (STDs) or Sexually Transmitted Infections (STIs) or Venereal Diseases: An Overview 

Sexually transmitted diseases (STDs) are caused by sexually transmitted infections (STIs). They are spread mainly by sexual contact. Bacteria, viruses, or parasites cause STIs. A sexually transmitted infection may pass from person to person in blood, semen, or vaginal and other bodily fluids.


Sometimes sexually transmitted infections are spread in ways other than sexual contact. For example, STIs can spread to infants during pregnancy or childbirth. STIs can also spread through blood transfusions or shared needles.


STIs don't always cause symptoms. A person can get sexually transmitted infections from another person who seems healthy and may not even know they have an infection.

STDs are also called Venereal Diseases.

Sexually Transmitted Infections (STIs) vs. Sexually Transmitted Diseases (STDs):

What is the difference between them?

Sexually transmitted infections (STIs) and sexually transmitted diseases (STDs) are frequently mistaken for one another.


An STI occurs when bacteria, viruses, or parasites infect the body. This infection may not present any symptoms.


An STD, however, typically develops from an untreated STI and is characterized by noticeable signs. Therefore, every STD begins as an STI, but not every STI progresses into an STD.

Transmission of Sexually Transmitted Infections (STIs):

Sexually transmitted infections (STIs) are primarily spread through vaginal, oral, or anal sex with an infected individual, though penetration is not always necessary.


Some STIs can also be transmitted through kissing, close physical contact (such as pubic lice, scabies, molluscum contagiosum, and mpox), from mother to child during pregnancy or childbirth (including syphilis, herpes, chlamydia, gonorrhea, HIV, and HPV), breastfeeding (HIV), and the use of contaminated medical equipment (HIV).


While STIs like chlamydia, pubic lice, and genital herpes are mainly transmitted through sexual contact, HIV can also spread through unsterilized needles.


It's important to understand that anyone can contract an STI, and many STIs can be spread through sexual activity that does not involve penetration.


Types of STDs/STIs:

Sexually Transmitted Diseases (STDs), also known as Sexually Transmitted Infections (STIs), encompass various types. Some of these are described below.

Chlamydia:

Chlamydia is a common sexually transmitted infection (STI) caused by the bacterium Chlamydia trachomatis. It can be contracted through vaginal, anal, or oral sex and can also be transmitted from mother to child during birth.


Often asymptomatic, untreated chlamydia can lead to infertility and other health issues. When symptoms are present, they typically manifest 2 to 6 weeks after exposure and may include a change in vaginal discharge and painful urination.


Chlamydia can also affect the rectum due to anal sex or spread from another infected area. Rectal involvement may cause:

  • Rectal pain.

  • Rectal bleeding.

  • Rectal discharge.

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Chancroid:

Chancroid is a bacterial STI caused by Haemophilus ducreyi, spread through sexual contact. It increases the risk of HIV transmission.


Symptoms appear within 3-7 days as painful genital or anal blisters that become open sores, potentially enlarging and damaging tissue. Groin lymph nodes may swell into painful buboes, sometimes forming abscesses.


Diagnosis involves a doctor's evaluation and culturing pus, though culture is difficult, so diagnosis relies on symptoms and exposure likelihood. Blood tests rule out other STIs. 


Treatment involves antibiotics, such as ceftriaxone injection or oral azithromycin, ciprofloxacin, or erythromycin. Buboes causing discomfort may be drained alongside antibiotics. 

 Recent sexual partners should also be examined and treated.


Prevention includes safer sex practices (condoms), reducing partners, and prompt diagnosis and treatment.

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Pubic Lice (Crabs):

Pubic lice, commonly known as crabs, primarily infest pubic hair. However, they can also reside in hair found in the armpits, mustache, beard, eyelashes, and eyebrows. These tiny parasites are often challenging to spot, but their presence can cause itching in the affected areas.


Newly hatched pubic lice resemble tiny crabs. Transmission typically occurs through close physical contact, including sexual activity. They can also spread via shared towels or bedding, but not through toilet seats.


For pubic lice in the genital region, over-the-counter medicated creams or shampoos available at most drugstores and pharmacies can be used for removal. Consulting a pharmacist can help in selecting appropriate products. If pubic lice affect hair near the eyes, a prescription medication may be necessary.

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Gonorrhea:

Gonorrhea is a sexually transmitted infection (STI) caused by the bacterium Neisseria gonorrhoeae. This bacterium thrives in warm, moist areas of the body including the vagina, penis, mouth, rectum, and eyes.

Transmission:

Gonorrhea can spread through oral, vaginal, or anal sexual contact. It can also be transmitted from an infected mother to her baby during childbirth. Touching an infected body area and touching the eye can also lead to gonococcal conjunctivitis (pink eye).

Symptoms:

Often, individuals with gonorrhea experience no symptoms. However, when symptoms do appear, they can vary depending on the affected body part. Potential symptoms include:

  • Painful urination

  • Discharge from the penis, vagina, or rectum

  • Swelling of the genitals

  • Bleeding between menstrual periods

  • Anal itching or pain

  • Painful bowel movements

  • Sore throat.

Complications:

Untreated gonorrhea can lead to serious health problems. In females, it can cause pelvic inflammatory disease (PID). In males, it may result in epididymitis, an inflammation of the sperm-storing tube. Both PID and epididymitis can impair fertility.

Treatment:

Gonorrhea is typically treated and cured with antibiotics.

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Herpes Simplex Virus (HSV):

The herpes simplex virus (HSV) is a prevalent virus with two main types, HSV-1 and HSV-2, both of which can cause genital herpes.

HSV-1: Primarily affects the mouth and typically spreads through saliva or contact with mouth sores. It can be transmitted to the genitals during oral sex.

HSV-2: Primarily affects the genital and anal areas, as well as the mouth.

  • Transmission occurs through vaginal, oral, and anal sex. Condom use does not entirely prevent its spread.

  • Crucially, HSV-1 and HSV-2 can be transmitted even when visible sores are absent. Furthermore, the virus can spread to other parts of the body if a person touches an infected area and then another part of their body. Herpes does not spread through everyday contact with objects like utensils, toilet seats, swimming pools, soap, or bedding.

  • Once contracted, the herpes virus remains in the body, though it may lie dormant, resulting in no symptoms for many individuals. Asymptomatic individuals can still shed the active virus and transmit the infection.

  • Symptoms of a herpes outbreak primarily involve blisters around the mouth, anus, or genitals. These blisters can rupture, forming painful sores that take over a week to heal. Additional symptoms may include painful urination and unusual discharge.

  • The frequency and severity of outbreaks vary. Some individuals never experience symptoms, others have a single initial outbreak, while some experience recurrent outbreaks. The first outbreak is typically the most severe. Individuals with weakened immune systems are at higher risk for severe symptoms. Herpes infection can also increase the risk of both contracting and transmitting HIV.

  • Currently, there is no cure for herpes. However, antiviral medications are available to alleviate symptoms and can be taken daily or episodically to help prevent the spread of the virus.

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Hepatitis B:

Hepatitis B is a virus that can lead to chronic infection and liver damage. The virus can be present in an infected person's semen, blood, and other bodily fluids.

Transmission can occur through:

  • Sexual contact

  • Sharing non-sterile needles for injections, tattoos, or piercings

  • Receiving unscreened or infected blood transfusions

  • From mother to child during pregnancy or childbirth (medical advice can help prevent this)

The risk of transmission through breast milk is very low if the nipples are not cracked.

Hepatitis B is preventable, and safe and effective vaccinations are recommended for everyone. Individuals unsure of their vaccination status and at risk should consult a healthcare professional.

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HIV:

  • HIV weakens the immune system, increasing susceptibility to other infections.

  • Without treatment, this can become life-threatening.

  • HIV is transmitted through bodily fluids like semen, blood, breast milk, and vaginal/rectal fluids entering another person's body via sexual contact, shared needles, broken skin contact, birth, or nursing.

  • Treatment can lower the viral load to undetectable levels, preventing transmission. Maintaining this requires strict adherence to the prescribed treatment plan.

  • Preventative measures include consistent condom or barrier use during sex, pre-exposure prophylaxis (PrEP), avoiding needle sharing, and using appropriate precautions with sharps and in healthcare settings.

  • Post-exposure prophylaxis (PEP) is available in emergencies within 72 hours of potential exposure.

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Human papillomavirus (HPV):

  • Human papillomavirus (HPV) is a common group of viruses that affects the skin and mucous membranes of the throat, cervix, anus, and mouth. While many individuals experience no symptoms, certain types can lead to genital warts and elevate the risk of cervical and throat cancers. Therefore, it is crucial to consult a doctor if you have any concerns about HPV.

  • HPV is transmitted through vaginal, anal, and oral sex, as well as genital-to-genital contact.

  • Prevention strategies include vaccination (like Gardasil 9), ideally before any HPV exposure (often around age 11). Doctors can provide guidance on HPV vaccination and screenings, recommending routine screening for high-risk individuals and regular cervical cancer screenings for females.

  • Other preventive measures include consistent condom or barrier method use (though not fully protective), abstaining from sex upon noticing genital warts, and maintaining a monogamous sexual relationship. Vaccines and screenings are vital in reducing the risk of HPV and related cancers.

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Molluscum contagiosum:

  • Molluscum contagiosum is generally a harmless viral skin infection. While some medical experts don't classify it as a sexually transmitted infection (STI) because it can spread through non-sexual contact, it commonly transmits between adults via skin-to-skin contact, including sexual activity or contact with lesions. Children can also contract it.

  • The infection manifests as small, round, indented bumps on the skin. These bumps typically resolve independently over time, but the infection remains contagious as long as the bumps are present.

Removal options for the bumps include:

  • Prescription medications

  • Chemical or electrical current application

  • Freezing

To prevent transmission, using barrier contraception is advisable. Individuals with the virus should practice thorough handwashing after touching affected skin areas to avoid spreading it to other parts of their body or different people. Shaving areas with visible lesions should also be avoided to prevent further spread.

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Scabies:

  • Scabies is a skin condition caused by the mite Sarcoptes scabiei. Although some healthcare professionals may not classify it as an STI like molluscum contagiosum, it is transmissible.

  • Scabies is characterized by a very itchy, pimple-like rash that can appear anywhere on the body. Symptoms may take 4 to 8 weeks to manifest. Notably, individuals can transmit scabies before showing symptoms.

  • Transmission typically occurs through direct skin-to-skin contact or by sharing personal items such as towels and bedding, and often not through sexual contact.

  • Treatment involves doctor-prescribed topical creams to kill the mites. During infection, close skin-to-skin contact should be avoided. After treatment, all personal items, especially bedding and clothing, should be decontaminated.

  • To prevent reinfestation, all household members, partners, and close contacts of an infected person require treatment.

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Syphilis:

Syphilis, a potentially severe infection caused by the bacterium Treponema pallidum, necessitates early treatment to avoid lasting damage and complications. The illness typically progresses through four stages.


Stages of Syphilis:

  • Primary: Characterized by painless sores appearing at the infection site (genitals, anus, rectum, or mouth), which may go unnoticed and last 3 to 6 weeks.

  • Secondary: May involve a rash (often on hands and feet or other areas), swollen lymph nodes, headaches, and fatigue.

  • Latent: Symptoms disappear, but the bacteria persist in the body and can still cause damage.

  • Tertiary: Can lead to life-threatening complications affecting the brain, nervous system, eyes, and other organs, with symptoms varying based on the affected body part.


The infection can spread at any stage, and syphilis can also be transmitted from a mother to her baby during pregnancy. Testing is available to detect syphilis. A positive test result requires informing sexual partners and seeking medical advice. Healthcare providers usually treat syphilis with antibiotics.

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Trichomoniasis:

  • Trichomoniasis, or trich, is a sexually transmitted infection caused by the parasite Trichomonas vaginalis. While it can affect anyone, it is more prevalent in individuals assigned female at birth and typically involves the vagina. In individuals assigned male at birth, the urethra is the common site of infection.

  • Trich is transmitted through penetrative sex and vulva-to-vulva contact.

  • Many individuals with trich experience no symptoms. However, when symptoms do occur, they can include:

  • Unusual discharge

  • Pain during urination

  • Pain during ejaculation

  • Painful sexual intercourse.


Trich infection can lead to complications during pregnancy and increase the risk of both contracting and transmitting HIV.


Trich can be effectively treated with prescription medication from a healthcare professional. To prevent reinfection, all sexual partners must receive treatment.


Types of STDs:

  • Although many STIs exist, the number of STDs is smaller. STDs can range in severity from pelvic inflammatory disease (PID), often resulting from STIs such as chlamydia and gonorrhea, to certain cancers linked to the human papillomavirus (HPV).

  • Key STDs to understand include:


AIDS:

  • HIV weakens the immune system, increasing susceptibility to other infections, bacteria, and certain cancers. However, with current treatments, many individuals with HIV can expect to live long and healthy lives. Without treatment, HIV can progress to AIDS, a condition where the body becomes highly vulnerable to serious infections and illnesses.

  • Individuals with AIDS may experience symptoms such as rapid weight loss, extreme fatigue, sores, infections, neurologic disorders, and cancers. Currently, there is no cure for AIDS. Due to the multitude of diseases that can arise from a severely compromised immune system, the life expectancy for individuals with untreated AIDS is approximately three years.

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Cancer:

  • Human papillomavirus (HPV) can cause various cancers, even though some strains are asymptomatic.

  • These cancers include oral, cervical, vulvar, penile, and anal cancers.

  • HPV is responsible for nearly all cervical cancers, over 90% of anal cancers, 75% of vaginal cancers, and over 60% of penile cancers.

  • The symptoms of these cancers differ depending on the affected body part, but common signs include swelling, lumps, bleeding, and pain.

  • Early diagnosis of HPV-related cancers generally leads to more treatable outcomes with options like chemotherapy, radiotherapy, or surgery.

  • Screening tests are available to identify precancerous cell changes caused by HPV.

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Genital warts:

  • Genital warts, a disease caused by lower-risk HPV strains, are skin-colored or white bumps that appear on the genitals or anus.

  • Over 350,000 people develop them annually.

  • While treatable, there is no cure, as the underlying virus may persist.

  • In some instances, HPV resolves spontaneously.

  • Genital warts may also disappear on their own, but can recur. Removal options include freezing, burning, or topical chemical treatments.

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PID:

  • Pelvic inflammatory disease (PID) is an infection of the female reproductive organs that can be caused by sexually transmitted infections (STIs) like gonorrhea, chlamydia, and trichomoniasis if these STIs are not treated. However, PID can also result from other bacterial infections.

  • While PID is classified as a disease, some individuals may not experience any symptoms. When symptoms are present, they can include pelvic or lower abdominal pain, pain during penetrative vaginal sex or urination, irregular, heavy, or painful vaginal bleeding, unusual vaginal discharge, nausea, and a high temperature.

  • If diagnosed and treated early, PID can be successfully treated with antibiotics. However, antibiotics cannot reverse any scarring that may have occurred on the fallopian tubes. Such scarring increases the risk of ectopic pregnancy and is linked to infertility, affecting approximately 1 in 10 people with PID.

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Tertiary syphilis:

  • Syphilis, initially an STI, begins with small, round sores on the genitals, anus, or mouth.

  • Untreated syphilis enters a latent, symptom-free phase. Approximately 25% of individuals progress to tertiary syphilis within 10 to 30 years.

  • This late stage can severely impact various organ systems, resulting in vision and hearing loss, memory problems, mental health issues, brain or spinal cord infections, and heart disease.

  • Early diagnosis and treatment of syphilis minimize potential damage.

  • Penicillin injections are the standard treatment for tertiary syphilis, eliminating the bacteria but not reversing existing damage.

  • Organ-specific complications may necessitate additional medications and procedures.

STDs and pregnancy:

Certain STIs can be passed from a pregnant person to their fetus or newborn during childbirth, though this is not true for all STDs.


Impact of Specific STIs During Pregnancy:

Syphilis: Can lead to severe infection in the baby, miscarriage, or stillbirth.

Genital Warts: Transmission to the baby is extremely rare.

PID (Pelvic Inflammatory Disease): Can increase the risk of ectopic pregnancy and cause infertility in approximately 1 out of 10 individuals, affecting future pregnancies.


Recommendations for Pregnant Individuals:

  • Undergo STI screening, including HIV and syphilis, to enable timely detection and treatment and prevent complications.

  • Consult a healthcare professional about any existing STDs. They will assess medication safety or may need to adjust or delay treatment.

  • Be aware that a cesarean delivery might be necessary, especially if genital warts obstruct vaginal stretching.


Symptoms of STDs:

  • STIs may present with various symptoms, including sores, pain during urination or sex, unusual discharge or bleeding, painful testicles, and swollen lymph nodes.

  • However, many STIs are asymptomatic and may only be detected later through complications or partner diagnosis.

  • Initial STI symptoms can appear days to years after exposure.

  • If an STI progresses to an STD, symptoms can include fever, recurring pain, fatigue, memory loss, sensory changes, nausea, weight loss, and lumps.

  • Importantly, not all STIs show symptoms.

Causes of STDs:

  • Sexually transmitted infections (STIs) are caused by bacteria (gonorrhea, syphilis, chlamydia), parasites (trichomoniasis), or viruses (HPV, herpes simplex virus, HIV/AIDS).

  • These infections are typically spread through sexual contact involving bodily fluids or skin contact during vaginal, oral, or anal sex.

  • While some infections may resolve on their own or with treatment, untreated pathogens can damage cells and lead to sexually transmitted diseases (STDs).

Risk factors:

  • Anyone who is sexually active risks getting or spreading STIs.

  • Risks increase with unprotected sex (vaginal, anal, or oral without latex/polyurethane condoms or dental dams), multiple partners, a history of STIs, forced sexual activity (seek immediate medical help), substance misuse impairing judgment, injecting drugs (sharing needles spreads serious infections like HIV and hepatitis), being young (15-24 year olds have higher rates), and mother-to-infant transmission during pregnancy/delivery (screen and treat pregnant women).

Complications:

  • Untreated STIs can spread via the bloodstream, causing serious issues like cardiovascular and brain infections (syphilis), severe infections and rare cancers (HIV), and various cancers (HPV).

  • In women, infections can lead to infertility, ectopic pregnancy, or pelvic inflammatory disease (PID). In men, untreated urethral infections can cause foreskin tightening, urethral narrowing, or fistulas.

  • Occasionally in men, infection spreads to the epididymis. In both sexes, some STIs can result in persistent genital swelling or urethral/rectal infection.

  • Prompt diagnosis and treatment are crucial to prevent these complications.

Lowering the Risk of Sexually Transmitted Infections (STIs): Prevention Tips:

To reduce the risk of STIs:

Use barrier methods: Consistent and correct use of condoms or dental dams can lower the risk of many STIs, although they may not prevent infections spread through skin-to-skin contact.

Communicate with partners: Discuss protected sex and any history of past infections with new partners.

Get tested: Ensure both partners undergo STI testing before starting a new sexual relationship and get regular STI checkups. Seek prompt treatment if any infections are detected.

Consider vaccination: Get vaccinated against STIs like HPV and hepatitis A/B.'

Reduce partners: Limiting the number of sexual partners decreases the risk of exposure.

Avoid risky substances: Reduce excessive alcohol and drug use, which can impair judgment.

Be open: Engage in open communication about sexual history with new partners.

Additional options: Consider male circumcision and PrEP (pre-exposure prophylaxis) for HIV risk reduction.


Important Note: Nonbarrier contraception (like birth control pills) does not protect against STIs.

In summary, STI prevention involves: abstinence or maintaining a monogamous relationship with an uninfected partner, testing with new partners, vaccination, consistent barrier use, avoiding substance misuse, open communication, and considering additional prevention methods.

Diagnosing STIs:

  • Doctors often suspect STIs based on symptoms or a history of sexual contact with an infected individual. To confirm the diagnosis and identify the specific organism, they may examine samples of blood, urine, or discharge from the vagina, cervix, or penis. These samples are typically sent to a lab for organism detection and identification, though some STI tests can be performed in the clinic.

  • STI tests detect the organism's unique genetic material (DNA or RNA) or identify antibodies produced by the immune system in response to the infection. Doctors select the appropriate test based on the suspected STI(s).

  • If one STI is diagnosed, such as gonorrhea, doctors will also test for other STIs like chlamydia, syphilis, and HIV due to the increased likelihood of co-infection.


STI Screening:

  • Screening involves testing for diseases in individuals without symptoms. It is most effective when the disease is common, individuals are at higher risk, or the disease is hazardous, the test is affordable and straightforward, and effective treatment is available.

  • Doctors recommend STI screening for individuals at increased risk for chlamydia, gonorrhea, syphilis, and/or HIV. Sexually active women under 25 and older women at high risk should be screened for chlamydia annually. All pregnant women should be screened for chlamydia, gonorrhea, syphilis, and HIV.

Treatment of STIs/STDs:

  • It's important to note that while treatment can manage STIs, existing damage caused by the disease is often irreversible.

  • Furthermore, some STDs, like genital warts and AIDS, are currently incurable.

  • Most bacterial and viral STIs are treatable with antibiotics or antivirals, though resistance is a growing concern.

  • Abstinence until treatment completion for all partners is vital for bacterial STIs.

  • Viral STIs like herpes and HIV can be managed but not cured with antivirals.

  • STD treatments vary (antibiotics, other medications, surgery, laser therapy), and lifestyle changes like temporary abstinence may be advised. While treatment manages STIs, existing damage is often irreversible, and some STDs (genital warts, AIDS) are currently incurable.


Frequently Asked Questions (FAQs):

What are the sexually transmitted infections?

  • Sexually transmitted infections (STIs), which may be converted into sexually transmitted diseases (STDs), are acquired through sexual contact (vaginal, oral, or anal) and sometimes skin-to-skin contact (herpes, HPV).

  • Symptoms include burning, itching, or discharge, but some STIs are asymptomatic. Transmission can also occur during pregnancy, childbirth, breastfeeding, blood transfusions, or needle sharing. Common STIs include chlamydia, genital herpes, genital warts, gonorrhea, hepatitis B, HIV/AIDS, HPV, pubic lice, syphilis, trichomoniasis, and vaginitis.

  • There are over 20 types of STIs.

Are MRSA considered STIs by health experts?

  • MRSA is not considered an STI because it spreads through skin-to-skin contact, not primarily through bodily fluids like blood, semen, or vaginal fluids.

  • While there's a small risk of community-associated MRSA (CA-MRSA) transmission during close physical contact, including sex, it's not a standard route.

  • Healthcare-associated MRSA (HA-MRSA) occurs in healthcare settings, while CA-MRSA spreads outside these settings.

  • Certain groups, like gay males, might have a higher risk if sores are present. Prevention tips include hygiene, avoiding sharing personal items, keeping wounds clean and covered, proper bandage disposal, and using barriers.

What are the symptoms of STIs?

  • STIs may have no or mild symptoms, allowing transmission without awareness.

  • If symptoms occur, they can include unusual genital discharge, sores or warts, painful or frequent urination, genital itching and redness, mouth blisters or sores, abnormal vaginal odor, anal issues, abdominal pain, or fever.

  • STI symptoms vary and may involve genital bumps, swelling, itching, discharge, unusual vaginal bleeding, painful sex or urination.

  • Systemic symptoms can include rash, weight loss, diarrhea, night sweats, aches, fever, chills, or jaundice.

What causes sexually transmitted infections?

Sexually transmitted infections (STIs) are caused by bacteria, viruses, or parasites transmitted through bodily fluids during sexual activity (vaginal, oral, anal, or other).

Are sexually transmitted infections contagious?

  • Sexually transmitted infections (STIs), also known as sexually transmitted diseases (STDs), are contagious and primarily spread through sexual contact involving bodily fluids or skin-to-skin contact, typically affecting the genitals. Some STIs, such as syphilis, can be transmitted from mother to child during birth.

  • Seeking medical treatment is crucial upon STI diagnosis, as some are curable. Prevention strategies include regular testing for sexually active individuals, open communication with sexual partners about diagnoses, and consistent use of protection during sexual activity.

What increases the chances of getting a sexually transmitted infection?

Sexually active individuals are at risk of STIs, which can also spread through shared blood-contaminated items like needles used in unregulated tattoos, piercings, or intravenous drug use.

Open communication with sexual partners about STI status, testing history, treatment, and protection use is crucial for prevention.

Untreated STIs can lead to serious, lifelong complications, including HIV/AIDS, organ and nervous system damage from syphilis (also risking developing fetuses), and increased risk of transmission.

In females, complications include pelvic inflammatory disease, ectopic pregnancy, infertility, and chronic pelvic pain. In males, they can cause urethral and prostate infections, swollen testicles, and infertility. Honest communication with partners helps prevent the spread and builds trust.

What are the potential health problems that can arise from sexually transmitted infections?

  • Untreated STIs can lead to severe, lifelong complications. For both sexes, this includes spreading the infection to partners.

  • HIV can progress to AIDS, and syphilis can damage organs, the nervous system, and infect a fetus. In females, complications include pelvic inflammatory disease (PID), potentially causing infertility and ectopic pregnancy, as well as chronic pelvic pain.

  • In males, untreated STIs can result in urethral and prostate infections, swollen testicles, and infertility.

How are sexually transmitted infections (STIs) diagnosed or screened?

  • If sexually active, discuss STI risk and testing with a healthcare provider, as many STIs lack symptoms.

  • Diagnosis involves physical exams or STI testing, like microscopic examination of sores/fluids or blood tests.

  • After diagnosis, inform sexual partners of their testing and of the need to prevent the spread.

  • STI tests (urine, swab, blood, fluid/cell samples) determine if you have an STI and are mostly painless.

  • Annual STI testing is recommended; more frequent testing (every 3-6 months or before new partners) is advised for multiple partners. Regular testing enables early detection and treatment.

  • Discuss a suitable testing schedule with a healthcare provider.

What are the available treatments for sexually transmitted infections (STIs)?

  • Bacterial or parasitic STIs are treated with antibiotics.

  • Viral STIs have no cure, but antiviral drugs can manage symptoms and reduce transmission risk.

  • Treating STIs is vital to avoid serious health issues.

  • STI treatment aims to cure some STIs, reduce symptoms and spread, and promote health. Treatments include oral or injected antibiotics and antivirals.

  • Improvement should be felt within days of starting medication; complete the course as directed and avoid sharing medications.

How can I lower my risk of developing a sexually transmitted infection?

  • To reduce STI risk, abstain from sex.

  • If sexually active: use condoms/dental dams consistently, choose partners carefully, and avoid sex if STI is suspected, get regular STI checks and ask new partners to do the same, avoid substance use before sex, learn STI signs/symptoms and seek prompt medical attention, and educate yourself about STIs.

Is it possible to stop the transmission of sexually transmitted infections?

  • Protect yourself and others from STIs by abstaining from sex, getting tested with partners before sex, using condoms consistently, reducing partners (consider mutual monogamy after testing), and getting vaccinated against HPV and hepatitis B.

  • If you have STI symptoms, avoid sex until treated and cleared by a healthcare provider; follow treatment instructions, get retested, and ensure partners are also treated.

Sexually Transmitted Infections (STIs): Who is Affected?

  • Sexually transmitted infections (STIs), or sexually transmitted diseases (STDs), can affect both men and women. However, the health complications arising from STIs are often more serious in women.

  • Furthermore, STIs can be transmitted to infants during birth, potentially leading to severe health issues for the newborn.

When should I see a healthcare provider?

  • If sexually active or showing STI symptoms, see a doctor immediately.

  • Schedule an appointment before new sexual activity or by age 21.

  • Seek medical advice if you suspect STI exposure, even without symptoms, and confirm home test results.

  • Don't delay care due to stigma; STIs are common and treatable, and early treatment prevents complications. 

  • Primary care doctors or specialists can help.

  • Get regular STI testing if sexually active and see a provider if you or your partner has symptoms.

  • If sexually active or have had an STI, discuss prevention, complications, testing, partner testing, treatment, duration, and side effects with your doctor.

How common are sexually transmitted infections?

US data on STI/STD:

  • Sexually transmitted infections (STIs), or sexually transmitted diseases (STDs), are widespread.

  • Annually, the United States sees over 25 million new STI cases, while globally, this number is an estimated 374 million.

  • A 2021 report indicated approximately 2.5 million cases of chlamydia, gonorrhea, and syphilis in the U.S., with about half affecting individuals aged 15 to 24.

Human Papillomavirus (HPV) Vaccination: Is it recommended?

  • Human papillomavirus (HPV) is the most prevalent viral STI in the United States. Individuals with HPV might be asymptomatic or develop genital warts. Notably, high-risk HPV strains can lead to cervical cancer.

  • Vaccination is available to prevent HPV and genital warts.

  • Healthcare professionals recommend that children between 11 and 12 years old receive the HPV vaccine for optimal effectiveness before sexual activity begins.

  • Vaccination is advised for all individuals up to age 26; recent data suggests potential benefits for those older than 45.

  • Consulting a healthcare provider can help determine if the HPV vaccine is appropriate.

What is expedited partner therapy?

EPT aims to prevent reinfection of the original patient and halt further transmission of the infection as quickly as possible. Usually, a healthcare provider would examine the partner before issuing a prescription.

What to expect if you have a sexually transmitted infection?

  • Many STIs are treatable and curable, though some require ongoing medication. Reinfection with the same STI is possible even after successful treatment.

  • It's important to remember that STIs are common, affecting millions of people. Experiencing embarrassment or shame after an STI diagnosis is understandable, but seeking support from friends, family, or a mental health professional can be beneficial in managing any related anxiety or stress. Statistics indicate that most individuals will contract an STI at some point in their lives.

What are the implications of having a sexually transmitted infection (STI) during pregnancy?

For pregnant individuals with an STI, immediate consultation with a healthcare provider is crucial to discuss treatment options that ensure the safety of both the mother and the fetus.

What's the outlook for sexually transmitted infections?

Many sexually transmitted infections (sexually transmitted diseases) can be cured. Unfortunately, there isn't a cure for all STIs. Conditions like HIV require lifelong care and treatment. You can get an STI again, even after treatment to cure it.

How do I take care of myself if I have a sexually transmitted infection?

Upon receiving an STI diagnosis, it is essential to:

  • Follow the prescribed medication schedule precisely.

  • Avoid all sexual activity until your healthcare provider confirms you are clear of the infection.

  • Notify your sexual partners so they can also get tested and treated.

  • After resuming sexual activity, consistently use condoms during every encounter. If a partner has a vagina, use a dental dam for oral sex.


Summary of the blog:

  • Sexually transmitted infections (STIs), also known as sexually transmitted diseases (STDs) or venereal diseases, are caused by bacteria, viruses, or parasites and spread through the exchange of body fluids during sexual contact (oral, anal, or genital). Some STIs can also spread through close physical contact, like kissing.

  • If left untreated, STIs can lead to serious health problems. Many STIs are treatable with medication, and consistent condom use during sex is an effective prevention method.

  • Factors that hinder STI prevention include unprotected sex, insufficient education about safer sexual practices, discomfort in discussing safer sex with partners or sexual health with healthcare providers, limited access to healthcare, asymptomatic infections, the necessity of treating all sexual partners, and incomplete treatment, which can lead to drug-resistant organisms.

  • Symptoms of STIs can include itching and burning in the genital area; however, many infections show no symptoms. Untreated STIs can result in complications such as pelvic pain, pregnancy complications, eye inflammation, arthritis, pelvic inflammatory disease (PID), infertility, heart disease, and certain cancers. Some STIs, like HIV, are incurable and can be life-threatening.

  • Prevention strategies are: practicing safer sex by consistently using condoms, reducing the number of sexual partners, vaccination against HPV, Hepatitis A, and Hepatitis B, and seeking prompt diagnosis and treatment, including informing sexual partners. Regular STI screenings are vital for sexually active individuals.

  • Diagnosis of STIs involves physical examinations, swab tests, blood tests, or specialized procedures.

  • Examples of STIs include chlamydia, pubic lice, hepatitis B, herpes simplex virus (HSV), trichomoniasis, HIV, molluscum contagiosum, scabies, human papillomavirus (HPV), syphilis, gonorrhea, and chancroid.

  • The World Health Organization (WHO) has identified eight key pathogens responsible for the majority of STI cases: the curable infections syphilis, gonorrhea, chlamydia, and trichomoniasis; and the currently incurable infections hepatitis B, HSV, HIV, and HPV.

  • In the United States, STIs are common, particularly among individuals aged 15 to 24.


Important Disclaimer:

This blog provides general information about STIs/STDs and is not a substitute for professional medical advice. The content is a summary from various sources and may not be accurate or exhaustive. It is not medical or legal advice and does not endorse specific treatments. Always consult a qualified healthcare professional for health concerns and before making any decisions related to your health or treatment, as self-medication can be dangerous. The author is not a health professional.

Regarding STDs/STIs (May 2025), my viewpoint:        

Sexually transmitted infections (STIs) or diseases (STDs) are health conditions that should be addressed proactively through appropriate treatment and perseverance. Individuals can often lead fulfilling everyday lives with proper medical care and lifestyle changes. It is crucial to seek guidance from a healthcare professional for any health challenge and avoid self-medication. Overcoming difficulties is possible, and enjoying life should be a priority. Even with chronic conditions, a fulfilling life remains achievable. I wish you good health.

The end.


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