Hepatitis A, B, C's

Hepatitis A, B, and C are three separate viruses that all inflame the liver but behave very differently. Hepatitis A spreads through contaminated food, water, or oral-anal contact and clears on its own. Hepatitis B and C spread mainly through blood and sex and can become lifelong infections. A and B are vaccine-preventable; C is curable but has no vaccine.

The three are different viruses

They share a name and a target organ, and that's most of what they have in common. Each has its own route of spread, its own typical course, and its own prevention strategy. Lumping them together is the most common mistake people make. The test you need, the shot that protects you, and whether the infection sticks around all depend on which letter you're dealing with. For a side-by-side rundown, see hepatitis a vs b vs c.

• Hepatitis A is an acute, self-limiting infection. Your body clears it and you recover completely, usually with lasting immunity.
• Hepatitis B can be acute or, especially in those infected early in life, become a chronic infection that needs long-term monitoring CDC.
• Hepatitis C frequently becomes chronic if untreated, but a short course of modern pills now cures the great majority of cases.

Hepatitis A: spread, course, and vaccine

Hepatitis A is a viral liver infection caused by the hepatitis A virus (HAV). Unlike B and C it does not cause chronic infection, and people recover completely CDC. It spreads by the fecal-oral route, meaning you swallow the virus, even in tiny amounts, from contaminated food or water or through close personal contact. Sexual transmission happens too, particularly through oral-anal contact, and outbreaks have clustered among men who have sex with men, people who use drugs, and people experiencing homelessness.

Not everyone with hepatitis A feels sick. Adults are more likely to have symptoms than children, and young kids are often infectious with no signs at all, which is how it spreads quietly through households. When symptoms do appear, they usually show up two to seven weeks after exposure: fatigue, nausea, abdominal pain, jaundice (a yellowing of the skin or the whites of the eyes from bilirubin backing up), dark urine, and clay-colored stools. For more on the timeline, see hepatitis A symptoms.

There's no specific antiviral for hepatitis A. Care is supportive, rest, fluids, and good nutrition, while the infection runs its course, and most people recover with no lasting liver damage. The strongest protection is the hepatitis a vaccine, and consistent hand hygiene helps cut spread as well. Reported acute cases fell sharply, from nearly 10,000 in 2020 to about 1,600 in 2023 as the large person-to-person outbreaks waned CDC, 2023.

Hepatitis B: spread, chronic risk, vaccine, and management

Hepatitis B is carried in blood and body fluids, so it passes through sex, shared needles, and from a parent to a baby during birth. Its biggest distinction from hepatitis A is that it can become chronic. The virus persists for years, silently inflaming the liver and raising the risk of cirrhosis (permanent scarring that stiffens the liver) and liver cancer over time. The younger someone is when infected, the higher the odds it becomes chronic, which is why newborn vaccination matters so much.

Like hepatitis A, hepatitis B is vaccine-preventable, and the shot is part of the routine schedule for infants and recommended for unvaccinated adults. There's no cure for chronic hepatitis B, but it's manageable. People with chronic infection are monitored with periodic blood work and liver imaging, and antiviral medication can suppress the virus and protect the liver when treatment is warranted. Many people with chronic hepatitis B live normal lifespans with monitoring.

Hepatitis C: spread, chronic risk, and the cure

Hepatitis C spreads primarily through blood-to-blood contact, most often shared injection equipment, and less commonly through sex or from parent to child CDC. It's the one most likely to slip into a chronic infection without any symptoms, sometimes for decades, until liver damage announces itself. Left untreated, chronic hepatitis C can lead to the same downstream problems as B: cirrhosis and liver cancer.

Direct-acting antivirals (DAAs), a course of pills taken for a defined stretch of weeks, cure the great majority of people who take the full regimen, often with few side effects CDC. There is no vaccine for hepatitis C. Prevention rests on not sharing needles, safer-sex practices, and getting tested so a quiet infection can be found and cured before it does damage.

How each one is tested

All three are diagnosed from a blood test, and the specific test differs by virus: an antibody screen, an antigen test, or a viral-load measurement depending on what your clinician is looking for. Getting tested is straightforward: a simple sample, results usually back in a few days, and often free or low-cost at health departments, Planned Parenthood, and Title X clinics. You can get tested through several routes, and it helps to compare testing providers for cost and turnaround before you go.

Timing matters because each virus has its own detection window, and testing too early after a possible exposure can miss it. Check when to test after exposure so you don't get a falsely reassuring result. Routine screening is also worthwhile because hepatitis B and C in particular can carry no symptoms for years, and the only way to know is to look.

How each is prevented

For hepatitis A and B, vaccination is the most effective protection, and both are part of standard adult and childhood immunization. Hepatitis C has no vaccine, so prevention leans entirely on avoiding blood-to-blood exposure and on testing. The everyday basics still help across all three: consistent hand hygiene blunts hepatitis A in households, and condoms used every time lower risk for the sexually transmitted routes. Routine testing finds what has no symptoms before it spreads or scars the liver.

If you've been exposed and you're not vaccinated, ask quickly. There are post-exposure steps for hepatitis A and B that work best when started early. And if a partner is diagnosed, ask whether you need testing or treatment too, so an infection doesn't bounce back and forth between you.

When to see a clinician

See a clinician if you develop jaundice, dark urine, persistent nausea or abdominal pain, or unexplained fatigue, especially after a possible exposure or travel. Get evaluated promptly if you share injection equipment, have a partner with hepatitis B or C, or have never been vaccinated against A or B. A diagnosis here is common and treatable, clinics handle these every day, and it says nothing about you as a person.

Keep exploring on EasySTD: STD vaccines, confidential testing by state and Hepatitis A testing.