Hepatitis B treatment depends on the stage. Acute infection usually needs only rest and supportive care while your body clears the virus. Chronic hepatitis B has no cure, but FDA-approved antiviral pills can suppress the virus and protect your liver. Many people are simply monitored until they meet specific criteria CDC.
2020–2023, steady
many undiagnosed
protective for 20+ years
vs <5% in adults
| Item | Value |
|---|---|
| Acute cases | ~2,200/yr — 2020–2023, steady |
| Chronic infection | ~640,000+ — many undiagnosed |
| Vaccine | ~100% — protective for 20+ years |
| Infant chronicity | ~90% — vs <5% in adults |
The essentials: a virus you manage, not always cure
Hepatitis B is a vaccine-preventable liver infection caused by the hepatitis B virus (HBV). It spreads mainly through blood and through sex, and you can carry it without ever feeling sick. Clinicians split it into two phases: acute hepatitis B is the short-term illness in the first six months after exposure, and chronic hepatitis B is infection that persists beyond six months, sometimes for life CDC, About Hepatitis B.
Age at the time of infection drives almost everything. Caught in adulthood, the immune system clears HBV in the great majority of people, and fewer than 1 in 20 go on to chronic infection. Caught in infancy, roughly 9 in 10 babies develop lifelong infection. That single fact is why a birth-dose vaccine matters so much, and why treatment strategy looks different for a healthy adult than for someone infected decades ago as a child.
Reported acute hepatitis B has held roughly steady at about 2,200 cases a year in recent surveillance, but that number badly undercounts the picture. Hundreds of thousands more Americans live with undiagnosed chronic infection CDC surveillance. Because HBV is bloodborne and sexually transmitted, see is hepatitis b an std? how it spreads sexually for the transmission details.
Symptoms: why most people feel fine
Many people with hepatitis B have no symptoms at all, which is why screening exists. When acute symptoms do appear, they tend to come from the liver fighting the infection: fatigue, fever, poor appetite, nausea, and abdominal pain in the upper-right belly where the liver sits. As the liver struggles to process bilirubin, you may notice dark urine, clay-colored stools, and jaundice (a yellow tint to the skin and the whites of the eyes). Some people also get joint pain.
Chronic hepatitis B is even quieter, and most people with it feel completely normal for years. That silence is dangerous. The virus can keep inflaming the liver in the background, slowly raising the risk of scarring (cirrhosis) and liver cancer without any warning sign. For a fuller breakdown, see hepatitis b symptoms.
Testing: the three-marker blood panel
Hepatitis B is diagnosed with a triple serologic panel from a single blood draw. Reading all three together tells your clinician where you stand:
- HBsAg (hepatitis B surface antigen) — a positive result means you have an active infection right now, acute or chronic.
- Anti-HBs (surface antibody) — signals immunity, either from recovery or from the vaccine.
- Total anti-HBc (core antibody) — a marker of past or current infection that the vaccine does not produce.
CDC now recommends that every adult aged 18 and older be screened at least once in their lifetime, and that pregnant people be screened in each pregnancy CDC, 2023. Testing is a quick blood sample, with results usually back in a few days, and it's free or low-cost at many health departments, Planned Parenthood, and Title X clinics CDC, diagnosis. If you're testing because of a specific exposure, timing matters; see when to test after exposure, or just go ahead and get tested.
Treatment: antivirals vs watchful waiting
For acute hepatitis B, the standard approach is supportive care — rest, fluids, good nutrition, and avoiding alcohol — while you're monitored. Most adults clear the virus on their own, so antivirals are usually reserved for severe or prolonged acute illness rather than given routinely.
For chronic hepatitis B there's no cure, but the news for the liver is good: antiviral medicines can suppress the virus, calm inflammation, and lower the long-term risk of liver cancer. The first-line oral drugs are tenofovir and entecavir, taken as a once-daily pill AASLD, 2018. They control the virus rather than eliminate it. Clearance happens in only a small share of people, even after a decade of treatment, so most people who start them take them long term, often for life.
Not everyone with chronic HBV needs a pill today, which is where watchful waiting comes in. A liver specialist tracks your viral load, liver enzymes, and signs of liver damage over time and starts antivirals when those markers cross treatment thresholds. The decision to treat or monitor is individualized and belongs with a specialist. This is not a self-managed condition.
| Approach | Who it's for | What to expect |
|---|---|---|
| Supportive care (acute) | Most adults with new acute HBV | Rest, hydration, no alcohol; the immune system usually clears it |
| Watchful waiting (chronic) | Chronic HBV not yet meeting treatment criteria | Regular blood tests and monitoring with a specialist; no daily medicine yet |
| Antiviral therapy (chronic) | Chronic HBV meeting treatment thresholds | Daily tenofovir or entecavir, usually long term, to suppress the virus and protect the liver |
A practical note on any HBV regimen: don't stop antivirals on your own once you feel well. Abruptly stopping can trigger a dangerous flare of liver inflammation, so changes go through your clinician. And because HBV is sexually transmitted, ask whether your partner has been vaccinated or tested so you're protected both ways.
Prevention: the vaccine does the heavy lifting
Vaccination is the single best protection against hepatitis B. ACIP recommends the hepatitis B vaccine for all adults aged 19–59, and for adults 60 and older who have risk factors CDC, 2022. Routine condom use lowers sexual transmission, and routine screening catches the infections that have no symptoms. For the full schedule and how the shots work, see hepatitis vaccines.
After a known exposure to an HBsAg-positive source, post-exposure prophylaxis is hepatitis B immune globulin (HBIG) plus the vaccine, given as soon as possible, ideally within 24 hours. The sooner it's given, the better it works.
Preventing mother-to-baby transmission
Hepatitis B can pass from a pregnant person to the baby around the time of birth, the most common way young children get infected, and the reason every pregnancy is screened for HBsAg CDC, perinatal. Because an infant infected at birth has about a 90% chance of lifelong infection, newborn prevention is critical. Every newborn gets the hepatitis B vaccine at birth, and a baby born to an HBsAg-positive parent also gets HBIG, both within 12 hours of delivery. Giving both the vaccine and HBIG drops transmission to roughly 3.6%, versus about 11.6% with vaccine alone, and adding an antiviral for mothers with high viral loads lowers it further to under 2% perinatal meta-analysis.
When to see a clinician
Get tested or seen if you've had a possible blood or sexual exposure, if you're pregnant, if you have unexplained fatigue with jaundice or dark urine, or simply because you've never had the one-time adult screen. Seek care urgently after a known exposure to an HBsAg-positive source, since post-exposure prophylaxis is time-sensitive. Clinics handle hepatitis B every day, and it says nothing about you as a person.