Some types of hepatitis can be sexually transmitted, but hepatitis itself is not exclusively an STD. There are five main types of viral hepatitis (A through E), and they spread through different routes. Hepatitis B is the one most strongly linked to sexual transmission, with roughly 38% of new infections in the United States attributed to sexual contact. Hepatitis A and, in certain circumstances, hepatitis C can also spread through sex.
Hepatitis B: The Most Common Sexually Transmitted Type
Hepatitis B is the type most firmly in the STD category. The virus spreads through blood, semen, and other body fluids, making unprotected vaginal, anal, or oral sex a major route of transmission. Between 2013 and 2018, an estimated 47,000 acute hepatitis B infections in the U.S. were caused by sexual contact, accounting for about 38% of all new cases during that period. In 2008, the figure was even higher, around 50%.
Hepatitis B can cause both short-term (acute) and lifelong (chronic) infection. Chronic hepatitis B is especially dangerous because it can silently damage the liver over years, potentially leading to cirrhosis or liver cancer. Many people with chronic infection don’t know they have it, which makes sexual transmission an ongoing concern.
The good news: hepatitis B is one of the few STDs that’s completely preventable with a vaccine. The CDC recommends vaccination for all adults aged 19 to 59, and for adults 60 and older who have risk factors. The vaccine is given as a series of two or three shots depending on the brand, spread over about one to six months. It provides long-term protection against both acute and chronic infection. If you’re sexually active and unsure whether you’ve been vaccinated, it’s worth checking.
Hepatitis A: Sexually Transmitted but Not Only Through Sex
Hepatitis A spreads primarily through the fecal-oral route, meaning contact with tiny amounts of fecal matter from an infected person. Sexual activity, particularly oral-anal contact, is one way this happens. But the CDC notes that transmission can occur from any sexual activity with an infected person and is not limited to fecal-oral contact alone.
Unlike hepatitis B, hepatitis A does not cause chronic infection. It makes you sick for weeks or sometimes months with symptoms like fatigue, nausea, fever, and jaundice, but your body clears the virus completely. Once you’ve recovered, you’re immune for life. A vaccine for hepatitis A is also available and highly effective.
Hepatitis C: Low Sexual Risk, With Exceptions
Hepatitis C is primarily a bloodborne virus. It spreads most efficiently through direct blood-to-blood contact, such as sharing needles. Sexual transmission of hepatitis C is possible but inefficient. Studies of heterosexual couples where one partner has hepatitis C have found either no increased risk or only a minimal one for the uninfected partner. In fact, the CDC notes that because sexual transmission between heterosexual couples has not been clearly demonstrated over time, condoms may not even be necessary solely for hepatitis C prevention in those relationships.
The picture changes for men who have sex with men, especially those living with HIV. Outbreaks of sexually transmitted hepatitis C have been reported in this population across multiple U.S. and European cities. The incidence among HIV-positive men who have sex with men is about 6.4 per 1,000 person-years, a rate high enough to be a recognized public health concern. For this group, condom use is specifically recommended to reduce hepatitis C risk. There is no vaccine for hepatitis C, though effective antiviral treatments can now cure it in most cases.
Hepatitis D and E: Minimal Sexual Concern
Hepatitis D only infects people who already have hepatitis B, since it requires the hepatitis B virus to replicate. It can technically spread through sexual contact, but only in someone already carrying hepatitis B. Getting vaccinated against hepatitis B effectively protects you from hepatitis D as well.
Hepatitis E spreads mainly through contaminated water and is rare in the United States. It is not considered a significant sexual health risk.
Symptoms to Recognize
All types of viral hepatitis produce similar symptoms, which can make it hard to tell them apart without testing. Common signs include fatigue, loss of appetite, nausea or vomiting, abdominal pain, dark urine, clay-colored stools, joint pain, fever, and jaundice (yellowing of the skin and eyes). Diarrhea is more specific to hepatitis A. These symptoms can overlap with other infections, but jaundice combined with dark urine is a strong signal pointing toward liver involvement.
Many people with hepatitis B or C, particularly chronic cases, have no symptoms at all for years. That’s why screening matters. The U.S. Preventive Services Task Force recommends hepatitis B screening for adolescents and adults at increased risk, including men who have sex with men, with periodic rescreening for those with ongoing risk factors.
Testing After Possible Exposure
If you think you may have been exposed to hepatitis through sexual contact, timing matters for accurate results. Hepatitis C antibody tests have a window period of about 8 to 11 weeks after exposure, meaning a test taken too early could come back negative even if you’re infected. A more sensitive test that detects the virus’s genetic material (RNA) can pick up hepatitis C as early as one to two weeks after exposure.
Hepatitis B testing can also take several weeks to become reliable. If you’ve had a specific exposure, let your provider know the timing so they can recommend the right test at the right time. For hepatitis B, post-exposure treatment is available and most effective when given within 24 hours.
How to Protect Yourself
Vaccination is the single most effective protection against the hepatitis types that spread sexually. Vaccines exist for both hepatitis A and B, and a combination vaccine covers both. Condoms reduce the risk of hepatitis B transmission during sex and are recommended for hepatitis C prevention among men who have sex with men, particularly those with HIV or multiple partners.
Because hepatitis B and C can be carried without symptoms for years, knowing your status through screening is just as important as prevention. If you’re sexually active with new or multiple partners, testing gives you information you can’t get any other way.