Hepatitis B Hepatitis B is a viral infection that affects the liver. It is caused by the hepatitis B virus (HBV). The hepatitis B vaccine can prevent hepatitis B infection. The hepatitis B virus is spread through contact with the blood or fluids of an infected person. It can be transmitted through sexual contact, sharing needles or other drug-injection equipment, or from an infected mother to her baby at birth . Some people with hepatitis B do not have any symptoms, but others may experience symptoms such as fever, fatigue, loss of appetite, stomach pain, dark urine, and jaundice (yellowing of the skin and eyes) . Hepatitis B can be a serious illness, and it can lead to liver damage, cirrhosis (scarring of the liver), liver cancer, and even death . If you think you may have been exposed to the hepatitis B virus, you should contact your healthcare provider for testing and treatment . Serious illness Yes, hepatitis B can be a serious illness. It can cause inflammation of the liver,
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