Early stage liver cancer can have no symptoms, but genetic defects in the body can be searched out through tumor high incidence gene testing, so as to achieve early detection and prevention. Pain in liver area, which is the most common and main symptom, is mostly hidden pain, distension or stabbing pain. If the pain in liver area of patients with liver disease turns into persistent pain and gradually worsens, and does not improve after resting or, alarm should be raised; Gastrointestinal symptoms, which may include loss of appetite, abdominal distension, nausea, etc., should be alerted to the possibility of liver cancer if Gastrointestinal symptoms are obvious and liver enlargement is found; weakness and wasting, which are not obvious in early stage and can Jaundice and fever are seen when liver cancer invades the bile ducts and emboli are formed in the bile ducts or when there are metastatic lymph nodes compressing the bile ducts, and there can be high fever when accompanied by infection; ascites, caused by cirrhosis, can be aggravated by accompanying liver cancer, and the nature of ascites can also change. Since the occurrence of liver cancer is related to chronic hepatitis B infection and cirrhosis, it is important to prevent hepatitis B infection. Patients with chronic hepatitis and cirrhosis should have regular checkups in hospitals. Liver cancer also has a certain relationship with diet, and one should not eat moldy food, reduce the intake of aflatoxin and pay attention to the hygiene of drinking water.