The severity of hepatitis A, hepatitis B and hepatitis C depends largely on how much damage the disease has done to the liver and how far it has progressed. Generally speaking, patients with hepatitis A recover more easily and have less liver damage, while hepatitis B is more severe, has a longer treatment period and causes more liver damage. Hepatitis A is an acute infectious hepatitis, and most patients can improve self-limitingly, and a small number of patients can be treated with liver protection and anti-yellowing therapy, and usually recover within a few months. Hepatitis B is relatively complex and severe, and liver failure often occurs, making treatment more difficult. Infection with the hepatitis B virus can also easily lead to chronic hepatitis B, and even cirrhosis and liver cancer. Although the current level of treatment can effectively control the hepatitis B virus and prevent or slow the progression of the disease. Hepatitis C also has two processes, acute and chronic infection, and can be completely cured with 3-6 months of oral DAA antiviral medication. If left untreated, the disease gradually worsens and may develop into cirrhosis, resulting in more serious clinical symptoms such as ascites, upper gastrointestinal bleeding, and even liver cancer.