What STDs Are Asymptomatic?

1. Chlamydia

Chlamydia is the most reported bacterial STI in the United States. [2] It is also one of the most frequently asymptomatic: studies estimate that up to 80% of women and roughly 50% of men with chlamydia experience no symptoms at all. [3]

When symptoms do occur, they typically appear 1 to 3 weeks after exposure and may include unusual discharge, burning with urination, pelvic pain (in women), or testicular pain (in men). Rectal infection — possible through anal sex — may cause discharge or rectal pain, and is also frequently asymptomatic.

Without treatment, chlamydia can spread to the reproductive organs and cause pelvic inflammatory disease (PID) in women, which can lead to infertility, chronic pelvic pain, and ectopic (tubal) pregnancy. In men, it can cause epididymitis, an inflammation of the tube that carries sperm. Because so many infections are silent, the CDC recommends annual chlamydia screening for all sexually active women under 25 and older women with risk factors. [2]

2. Gonorrhea

Gonorrhea is caused by the bacterium Neisseria gonorrhoeae and commonly co-occurs with chlamydia. Like chlamydia, it is very often asymptomatic — particularly in women, where rates of no-symptom infection can exceed 50%. [4] In men, gonorrhea is more likely to cause symptoms (discharge, burning urination), but asymptomatic infection still occurs, especially in the rectum and throat.

Symptoms, when present, typically appear within 1 to 2 weeks of exposure. They can include discharge from the vagina or penis, painful urination, rectal pain or discharge, and throat irritation following oral sex.

Untreated gonorrhea carries the same serious complications as chlamydia: PID, infertility, and increased HIV transmission risk. There is also growing concern about antibiotic-resistant gonorrhea strains, making early detection and treatment more important than ever. [2]

3. Herpes (HSV-1 and HSV-2)

Herpes is caused by two related viruses: herpes simplex virus type 1 (HSV-1, typically associated with oral herpes) and type 2 (HSV-2, typically associated with genital herpes). Both can infect either site through oral, genital, or anal contact.

Herpes is remarkably common — and remarkably silent. The CDC estimates that approximately 87% of people with genital herpes (HSV-2) have never received a diagnosis because they have either no symptoms or symptoms so mild they go unrecognized. [5] Many people are unaware of their status for years or even decades.

This matters because herpes can still be transmitted even when there are no visible sores or outbreaks. This is called asymptomatic viral shedding — the virus is active on the skin surface and transmissible, but causes no noticeable symptoms. When symptoms do occur, they include clusters of blisters or sores, itching or burning in the genital area, flu-like symptoms during a first outbreak, and in some cases, pain during urination.

Herpes is a lifelong infection that cannot be cured, but antiviral medications can reduce outbreak frequency and lower the risk of transmission. Knowing your status allows you to make informed decisions with partners and protect them accordingly.

4. Human Papillomavirus (HPV)

HPV is the most common STI in the United States — so common that nearly all sexually active people will contract it at some point in their lives. [6] Most HPV infections cause no symptoms whatsoever and clear on their own within 1 to 2 years. Many people never know they had it.

The challenge is that certain high-risk strains of HPV (particularly HPV 16 and 18) can persist and cause abnormal cell changes that may eventually lead to cervical cancer, as well as cancers of the throat, anus, penis, vagina, and vulva. [6] Genital warts are caused by low-risk HPV strains (typically HPV 6 and 11) and may be visible, but often are not.

There is no standard at-home test for HPV. Cervical screening (Pap smear and HPV co-test) is the primary way HPV-related cell changes are detected in people with a cervix. HPV vaccination (Gardasil 9) is highly effective at preventing the most dangerous strains and is recommended for people up to age 26, and in some cases through age 45. [6]

5. HIV

HIV (human immunodeficiency virus) attacks the immune system and, without treatment, can progress to AIDS. HIV infection moves through several stages — and the asymptomatic phase can last for a decade or longer. [7]

Shortly after initial infection (typically 2 to 4 weeks), some people experience a brief flu-like illness called acute HIV syndrome — fever, swollen lymph nodes, sore throat, rash, and muscle aches. These symptoms often go unrecognized or are mistaken for another illness. After this phase, HIV typically enters a chronic stage during which there are no symptoms for years, even as the virus continues to damage the immune system.

During the asymptomatic phase, HIV can still be transmitted to others. Early diagnosis through regular testing allows people to start antiretroviral therapy (ART), which can reduce viral load to undetectable levels. When viral load is undetectable, there is effectively zero risk of transmitting HIV to a sexual partner — a concept known as Undetectable = Untransmittable (U=U). [8]

The CDC recommends at least one HIV test for everyone between ages 13 and 64, and more frequent testing for people at higher risk. [2]

6. Syphilis

Syphilis is a bacterial infection that progresses through distinct stages — and its latent stage is entirely asymptomatic, meaning there are no symptoms at all while the bacteria continue to cause damage. [9]

Syphilis progression looks like this:

• Primary stage: A painless sore (chancre) appears at the site of infection, typically lasting 3 to 6 weeks. Because the sore is painless and may be hidden internally, it is often missed entirely.
• Secondary stage: A rash, flu-like symptoms, and mucous membrane lesions appear weeks later. These symptoms resolve on their own, even without treatment.
• Latent stage: No symptoms. This phase can last for years — divided into early latent (less than 1 year) and late latent (more than 1 year). The infection is not sexually transmissible in late latent syphilis, but serious organ damage continues to develop silently. [9]
• Tertiary (late) stage: Can affect the heart, brain, and nervous system — causing blindness, dementia, paralysis, or death if untreated.

Syphilis rates have surged in the U.S. in recent years. Getting tested is especially critical given how well the infection hides itself across multiple stages.

7. Trichomoniasis

Trichomoniasis is caused by the parasite Trichomonas vaginalis and is one of the most common — and most overlooked — curable STIs worldwide. Over 80% of people with trichomoniasis have no symptoms at all. [10]

When symptoms do appear, they typically develop within 5 to 28 days of exposure. In women, symptoms include itching, redness, soreness, or a frothy, foul-smelling vaginal discharge. In men, symptoms — if any — may include mild discharge or burning after urination or ejaculation.

Though it is easily cured with a single dose of antibiotics, untreated trichomoniasis increases susceptibility to HIV and other STIs, and during pregnancy can increase the risk of preterm birth and low birth weight. [10] It is frequently not included in standard STI panels unless specifically requested.

8. Hepatitis B

Hepatitis B is a liver infection caused by the hepatitis B virus (HBV) and transmitted through sexual contact, blood, or from mother to child. Many people — particularly those with acute infection — have no symptoms at all. [11]

When symptoms do occur, they usually appear 6 weeks to 6 months after exposure and include fatigue, abdominal pain, nausea, vomiting, jaundice (yellowing of the skin or eyes), and dark urine. In about 90% of adults with healthy immune systems, the body clears the virus on its own within 6 months. The remaining 10% develop chronic hepatitis B, which can lead to liver cirrhosis, liver failure, and liver cancer over time. [11]

A safe and effective vaccine for hepatitis B exists and is recommended for all unvaccinated people. Treatment for chronic hepatitis B can manage the virus and reduce the risk of complications.

9. Hepatitis C

Hepatitis C is caused by the hepatitis C virus (HCV) and is transmitted mainly through blood-to-blood contact, including sharing needles, but also through sexual contact — particularly in men who have sex with men or people with multiple partners. [12]

Approximately 75 to 80% of people with acute hepatitis C experience no symptoms. [12] The infection often goes undetected until a routine blood test or until liver damage has already occurred. Chronic hepatitis C — which develops in 55 to 85% of those infected — can silently damage the liver for years before causing symptoms like fatigue, abdominal pain, or jaundice.

Hepatitis C is now curable with direct-acting antiviral medications that clear the virus in over 95% of cases. [12] Early diagnosis dramatically improves outcomes.

Because STDs can be asymptomatic and, thus, many people may not know that they are infected, it is important to get tested and treated by qualified healthcare providers if you or a partner has an STD. Just because an STD does not present with symptoms does not mean that it isn’t doing damage to the body. Having an infection that goes untreated can cause many undesirable effects like infertility, increased risk for infections, and increased risk for some cancers.[12]

STIs affect the reproductive tract, as they are most commonly passed during sexual activities. Therefore, one of the most common effects is damage to the reproductive organs.[12] In addition, inflammation and scarring from infection can cause pregnancy complications later in life if the fallopian tubes become scarred.[12]

Certain untreated STDs like HPV and hepatitis B can increase one’s risk for cancers due to the damage that these viruses cause to the immune system. If these STDs go untreated in the body and viral load increases, this can weaken the immune system, which makes your body more susceptible to cancer-causing cells or viruses.[12]

To best protect your sexual health and well-being and to prevent infection with asymptomatic STDs, it is important to get regularly tested. If you are sexually active, testing regularly for STDs is imperative. The following are the CDC's recommended testing protocols [13]:

• All people between the ages of 13 and 64 should be screened for HIV at least once.
• All sexually active women under 25 years old and/or over 25 years old with multiple partners and/or risk factors should be tested for gonorrhea and chlamydia yearly.
• All pregnant women should be tested for syphilis, HIV, hepatitis B, and hepatitis C once they find out that they are pregnant.
• All men who have sex with other men should be tested at least once a year for syphilis, chlamydia, gonorrhea, and HIV. More frequent testing may be warranted depending on individual circumstances.
• All people who are at risk for infection or who share drug equipment should be tested for all STDs regularly.
• All people who have oral and/or anal sex should be tested for all STDs regularly.

At Everlywell, we combine the best in modernized, rigorous lab testing with easy-to-access, at-home medicine. We provide a range of blood tests, including several sexual health tests that you can take from the comfort of your home. Your results will be analyzed in CLIA-certified labs and an experienced healthcare provider will deliver your results. We also provide virtual care visits so you can meet with a provider from the comfort of your home.