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Hepatitis B
Reviewed by Medicinsk Expert•Last updated: 2026-10-22•Infections

Hepatitis B

Hepatitis B is a viral liver infection that can be acute or chronic, but it is largely preventable through vaccination.

What is hepatitis B?

Hepatitis B is a type of viral hepatitis that causes liver inflammation. While many people with acute infections recover on their own, some develop chronic infections that require medical treatment.

What causes hepatitis B?

It is caused by the hepatitis B virus, which spreads through contact with blood, semen, or other body fluids from an infected person.

Who is at risk for hepatitis B?

Risk is higher for:

  • Infants born to mothers with hepatitis B
  • People who inject drugs or share needles
  • Sex partners of people with hepatitis B
  • Men who have sex with men
  • People living with someone who has hepatitis B (sharing razors, toothbrushes, etc.)
  • Health care and public-safety workers exposed to blood
  • Hemodialysis patients
  • People who have lived in or traveled to regions where the virus is common
  • People with diabetes, hepatitis C, or HIV

What are the symptoms of hepatitis B?

Many people have no symptoms. When they do occur (usually 2 to 5 months after infection), they include:

  • Dark yellow urine and gray- or clay-colored stools
  • Fatigue and fever
  • Joint pain and abdominal pain
  • Loss of appetite, nausea, and/or vomiting
  • Jaundice

Because chronic hepatitis B may not show symptoms for decades, screening is vital for those at high risk.

What other problems can hepatitis B cause?

Chronic hepatitis B can lead to cirrhosis, liver cancer, and liver failure. Additionally, the virus can reactivate later in life, causing new liver damage.

How is hepatitis B diagnosed?

Diagnosis involves a medical history, physical exam, and blood tests for viral hepatitis.

What are the treatments for hepatitis B?

Acute hepatitis B usually requires no treatment. For chronic infections, antiviral medicines may be prescribed if blood tests indicate liver damage.

Can hepatitis B be prevented?

The best prevention is the hepatitis B vaccine. Other precautions include:

  • Not sharing needles or drug materials
  • Wearing gloves when touching blood or open sores
  • Ensuring tattoo and piercing tools are sterile
  • Not sharing personal items like toothbrushes or razors
  • Using latex or polyurethane condoms during sex

If you suspect exposure, contact a provider immediately; receiving the vaccine and hepatitis B immune globulin (HBIG) within 24 hours can help prevent infection.

Frequently Asked Questions

While an undetectable viral load significantly reduces the risk of transmission, it does not eliminate it entirely. The virus can still be present in body fluids such as semen and blood, even when blood tests show no detectable levels. Therefore, consistent use of barrier protection, such as condoms, is recommended for sexual partners who are not vaccinated or do not have immunity. Additionally, partners should be tested for immunity and vaccinated if they are not already protected. What specific lifestyle changes can help protect the liver in someone with chronic hepatitis B?::The most critical lifestyle change is the complete avoidance of alcohol, as the combination of hepatitis B and alcohol use accelerates liver damage and increases the risk of cirrhosis and liver cancer. Patients should also avoid unnecessary exposure to hepatotoxic substances, including certain over-the-counter medications like high-dose acetaminophen, unless approved by a healthcare provider. Maintaining a healthy weight through a balanced diet and regular exercise can also reduce the burden on the liver and lower the risk of fatty liver disease, which compounds hepatitis B-related damage. How often should individuals with chronic hepatitis B undergo monitoring, and what tests are typically involved?::Monitoring frequency depends on the stage of the disease and whether the patient is on antiviral therapy. Generally, patients are monitored every three to six months. This involves blood tests to check liver function (ALT, AST), viral load (HBV DNA), and hepatitis B surface antigen levels. Additionally, an ultrasound of the liver is typically performed every six months to screen for liver cancer, especially in patients with cirrhosis, a family history of liver cancer, or those over the age of 40. Is it safe to take herbal supplements or alternative medicines while being treated for hepatitis B?::Many herbal supplements and alternative medicines are not regulated for safety or efficacy and can potentially cause liver injury or interact with prescribed antiviral medications. Some herbs have been linked to drug-induced liver injury, which can be particularly dangerous for a liver already compromised by hepatitis B. Patients should always consult their hepatologist or primary care provider before starting any new supplement, vitamin, or alternative therapy to ensure it will not interfere with their treatment or worsen liver function.
Source: MedlinePlus, National Library of Medicine

MedlinePlus brings together authoritative health information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), and other government agencies and health-related organizations.

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