Common causes of cirrhosis include viral infections, fatty liver disease, immunologic diseases, drug or chemical toxic damage, cholestasis, and parasitic infections. 1. Viral infection: especially chronic viral hepatitis caused by hepatitis B virus and hepatitis C virus may develop into cirrhosis with diffuse fibrosis of liver parenchyma, formation of pseudo lobe and regenerative nodules. 2. Fatty liver disease: including non-alcoholic fatty liver and alcoholic fatty liver, with the progressive development of the disease, some patients can evolve into cirrhosis. 3. Immune diseases: such as autoimmune liver disease caused by liver function damage, some patients will gradually go to cirrhosis. 4. Drug or chemical poison damage: long-term use of some drugs may cause chronic liver damage, exposure to some chemical poisons may cause acute liver injury, some patients may also progress to cirrhosis. 5. Cholestasis: Biliary obstruction inside and outside the liver caused by any reason, leading to persistent cholestasis, may also appear biliary cirrhosis. 6. Parasitic infection: the eggs of Schistosoma haematobium are deposited in the vicinity of the branches of portal vein, which can easily cause portal hypertension; in addition, Schistosoma haematobium parasitizes in the bile ducts inside and outside the liver, resulting in biliary obstruction and chronic inflammation, which will progress to cirrhosis in some patients. Once cirrhosis occurs, you should actively cooperate with your doctor for treatment.