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Definition
By Mayo Clinic staffHepatitis B is a serious liver infection caused by the hepatitis B virus (HBV). For some people, the infection becomes chronic, leading to liver failure, liver cancer, or cirrhosis — a condition that causes permanent scarring of the liver.
The hepatitis B virus is transmitted through contact with the blood and body fluids of someone who is infected. You're especially at risk if you are an intravenous (IV) drug user who shares needles or other paraphernalia, have unprotected sexual contact with an infected partner, or were born in or travel to parts of the world where hepatitis B is widespread. In addition, women with HBV can pass the infection to their babies during childbirth.
Most people infected as adults recover fully from hepatitis B, even if their signs and symptoms are severe. Infants and children are much more likely to develop a chronic infection. Although no cure exists for hepatitis B, a vaccine can prevent the disease. If you're already infected, taking certain precautions can help prevent spreading HBV to others.
Symptoms
