Hepatitis B

Key facts Hepatitis B is a viral infection that affects the liver. Symptoms of hepatitis B include dark urine, nausea and fatigue. However, many people have no symptoms at all. Hepatitis B infection can be either acute (when the illness lasts for less than 6 months), or chronic (the illness lasts for longer than 6 months). Hepatitis B can be prevented with vaccination. What is hepatitis B? Hepatitis B is a liver infection caused by the hepatitis B virus. It can cause long lasting liver damage. Hepatitis B can be acute or chronic. If a person has acute hepatitis B,