Acute Hepatitis B Infection
What is Acute Hepatitis B Infection?
Acute hepatitis B infection is a viral liver disease caused by the hepatitis B virus. This virus attacks liver cells and triggers inflammation. When you first get infected with hepatitis B, the infection is considered acute.
Most healthy adults clear the virus within 6 months. During this acute phase, the virus actively replicates in your liver. Your immune system works to fight off the infection. Some people have no symptoms at all during acute infection.
If your body cannot clear the virus after 6 months, it becomes chronic hepatitis B. Chronic infection can lead to serious liver damage over time. Early detection helps you monitor liver health and prevent complications.
Symptoms
- Fatigue and weakness
- Loss of appetite
- Nausea and vomiting
- Abdominal pain, especially in the upper right side
- Dark urine
- Clay-colored bowel movements
- Joint pain
- Jaundice, yellowing of skin and eyes
- Fever
Many people with acute hepatitis B have no symptoms, especially in the early weeks. Symptoms typically appear 1 to 4 months after exposure when present. Children under age 5 rarely show symptoms even when infected.
Concerned about Acute Hepatitis B Infection? Check your levels.
Screen for 1,200+ health conditions
Causes and risk factors
Hepatitis B spreads through contact with infected blood or body fluids. The virus enters your bloodstream and travels to your liver. Common ways people get infected include unprotected sex, sharing needles, needlestick injuries in healthcare settings, and from mother to baby during childbirth. Sharing personal items like razors or toothbrushes can also transmit the virus.
Risk factors include having multiple sexual partners, using injection drugs, living with someone who has hepatitis B, working in healthcare, receiving hemodialysis, and traveling to areas where hepatitis B is common. The virus is 50 to 100 times more infectious than HIV. You cannot get hepatitis B from casual contact like hugging, kissing, or sharing food.
How it's diagnosed
Doctors diagnose acute hepatitis B through blood tests that detect viral markers and antibodies. The hepatitis B surface antigen test shows if you currently have the virus. This marker appears 1 to 10 weeks after exposure and is the hallmark of acute infection. Hepatitis B core antibody tests detect your immune response to the virus. The IgM version indicates a recent infection.
Rite Aid offers hepatitis B testing as an add-on to our blood testing service. You can get tested at Quest Diagnostics locations nationwide. Early detection helps you start monitoring liver function and prevents spreading the virus to others. Your doctor may also order liver enzyme tests to check for liver damage.
Treatment options
- Rest and avoid alcohol to let your liver heal
- Drink plenty of fluids to stay hydrated
- Eat small, frequent meals if nausea is present
- Avoid medications that stress the liver, including acetaminophen
- Get vaccinated if you test negative for hepatitis B
- Practice safe sex and do not share needles or personal care items
- Monitor liver function with regular blood tests
- Antiviral medications may be prescribed for severe acute cases
- See your doctor if symptoms worsen or persist beyond 6 months
Need testing for Acute Hepatitis B Infection? Add it to your panel.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Acute hepatitis B typically lasts less than 6 months in most adults. Symptoms, when present, usually appear 1 to 4 months after infection and resolve within a few weeks to months. About 95% of healthy adults clear the virus completely. If the infection persists beyond 6 months, it becomes chronic hepatitis B.
Yes, you can spread hepatitis B even before symptoms appear. The virus can be present in your blood and body fluids during the incubation period. This is why hepatitis B spreads easily and why prevention through vaccination is so important. You remain infectious as long as the virus is in your body.
Three main blood tests detect acute hepatitis B infection. Hepatitis B surface antigen appears first, usually 1 to 10 weeks after exposure. Hepatitis B core antibody IgM indicates a recent infection. Total hepatitis B core antibody shows your immune system is responding to the virus.
There is no specific cure, but most healthy adults clear acute hepatitis B naturally within 6 months. Your immune system fights off the virus without medication in about 95% of adult cases. Treatment focuses on rest, hydration, and avoiding substances that stress your liver. Antiviral drugs may be used in severe cases.
Anyone with risk factors should get tested. This includes people with multiple sexual partners, injection drug users, healthcare workers, pregnant women, and people born in countries where hepatitis B is common. Testing is also important if you live with someone who has hepatitis B or have elevated liver enzymes.
Yes, acute hepatitis B can become chronic if your body does not clear the virus within 6 months. About 5% of infected adults develop chronic hepatitis B. Infants and young children face much higher risk, with 90% of infected babies becoming chronically infected. Regular monitoring helps catch this transition early.
Avoid alcohol completely while your liver heals. Skip medications that can damage the liver, especially acetaminophen and certain supplements. Eat a balanced diet and stay hydrated. Get plenty of rest to help your immune system fight the infection.
You do not need complete isolation, but you should take precautions. Avoid sexual contact and do not share razors, toothbrushes, or needles. Cover any cuts or wounds. Hepatitis B does not spread through casual contact like hugging or sharing meals. Tell your healthcare providers and close contacts about your infection.
See a doctor immediately if you develop jaundice, severe abdominal pain, confusion, or extreme fatigue. These may signal serious liver problems. Also seek care if symptoms persist beyond a few weeks or if you know you were exposed to the virus. Early diagnosis helps prevent complications and transmission.
Yes, the hepatitis B vaccine combined with immunoglobulin can prevent infection if given within 24 hours of exposure. This post-exposure prophylaxis is highly effective. Even if you were not vaccinated before, getting the vaccine after a negative test protects you from future infections. The vaccine series includes 3 or 4 shots over 6 months.