Hepatitis is inflammation of the liver. The condition can subside spontaneously and it can also develop liver fibrosis ("scarring"), liver cirrhosis, or liver cancer. Hepatitis virus is the most common cause of hepatitis in the world, but other infections, toxic substances (such as alcohol and certain drugs, etc.) as well as autoimmune diseases can also cause hepatitis.
There are five types of hepatitis viruses, namely A, B, C, D and E. Due to the disease burden of the disease and the resulting deaths, as well as the possibility of outbreaks and epidemic spreads, the five types of hepatitis are most concerned. In particular, hepatitis B and C cause hundreds of millions of people with chronic diseases, and both are the most common causes of cirrhosis and cancer.