What It Is
Hepatitis B is a viral infection that primarily affects the liver, caused by the hepatitis B virus. It can occur as a short-term, acute infection or develop into a long-term, chronic condition.
How It Develops
The hepatitis B virus spreads through contact with infected blood or certain other bodily fluids, and it can also be passed from an infected mother to her baby around the time of birth. Once inside the body, the virus infects liver cells, and the resulting immune response to the infection causes inflammation within the liver. In some people, particularly when infection occurs during infancy or early childhood, the infection can persist long-term, becoming a chronic condition, whereas infection acquired in adulthood more often resolves on its own.
General Symptoms
Many people with hepatitis B, particularly in the early stages, experience no noticeable symptoms at all. When symptoms do occur, they can include fatigue, loss of appetite, nausea, abdominal discomfort, and yellowing of the skin or eyes, known as jaundice. Chronic hepatitis B often remains without symptoms for years, even as liver damage may be slowly progressing in the background.
General Treatment Approaches
Acute hepatitis B often resolves on its own without specific antiviral treatment, with care generally focused on supporting the body through the infection. Chronic hepatitis B, when treatment is needed, generally involves antiviral medications aimed at suppressing the virus and reducing ongoing liver damage, along with regular monitoring of liver health over time. Vaccination remains a key tool for preventing hepatitis B infection in the first place.
Background
Hepatitis B was identified as a distinct virus in the late 1960s, a discovery that earned its researcher a share of the Nobel Prize and paved the way for the development of both diagnostic testing and, later, an effective vaccine. The hepatitis B vaccine, introduced in the early 1980s, was notable as one of the first vaccines developed against a virus known to cause cancer, given hepatitis B's association with an increased long-term risk of liver cancer in chronic cases.