The liver is known as the “processing plant” of the human body, which is responsible for the synthesis and decomposition of various nutrients in the body; in addition, it also plays the role of detoxification, detoxification, endocrine, blood storage and immunity. Once the liver is damaged, it not only disrupts the normal production order of the “factory”, but also causes dysfunction of other tissues and organs in the body. Among the many factors that can damage the liver, viruses are the most common cause. According to the classification of the causative viruses, there are five types of viral hepatitis, namely viral hepatitis A, B, C, D and E. Among them, hepatitis A and E are the most common viruses. Among them, hepatitis A and E are acute, while hepatitis B and C are mostly chronic. Viral hepatitis is contagious, among which hepatitis A and E are transmitted through the digestive tract, while hepatitis B and C are contracted through the blood route; hepatitis D is mostly accompanied by hepatitis B. In addition to viral liver disease, there are also drug-related liver injury, autoimmune liver disease, alcoholic liver disease, fatty liver disease, and congenital liver disease. The naming of these liver diseases shows that their etiology is related to medication, immune dysfunction, alcoholism, excessive fat deposits in liver tissue, and congenital liver defects. When we talk about liver diseases here, we mainly talk about prevention, diagnosis and treatment. First, prevention. Nowadays, the health view of “treating the disease before it happens” has become popular, and liver disease can also be prevented before it happens, divided into self-prevention and medical prevention. For liver diseases that come from the mouth, we need to strengthen the awareness of self-prevention, such as hepatitis A and E, alcoholic hepatitis and steatohepatitis, which can be prevented through dietary hygiene, abstaining from alcohol, controlling calorie intake and increasing exercise, and adopting good lifestyle habits, respectively. Certain liver diseases can be prevented medically, for example, vaccination against hepatitis A and hepatitis B can prevent hepatitis A and some hepatitis B respectively; mastering medication techniques, standardizing medication, or using liver protection drugs prophylactically can prevent certain drug-related liver diseases. For those liver diseases that can neither be self-prevented nor medically protected, such as autoimmune liver disease and hereditary liver disease, early detection and treatment can prevent the development of severe and advanced liver disease, which also belongs to prevention. Secondly, diagnosis. At least three aspects should be included: first, timely detection of liver disease in the asymptomatic phase. The onset of many liver diseases is insidious and there may be no symptoms in the early stage. It is not uncommon for liver disease to progress to the point of cirrhosis before it is diagnosed. It is advisable to have a sense of regular health checkups, as only timely detection of liver disease can make early treatment of liver disease possible and prevent aggravation of liver disease. The second is to seek medical attention in time with symptoms. There are some common manifestations after liver damage, such as pain in the liver area, weakness, nausea and vomiting, jaundice, etc. Once you have symptoms, you must immediately see a doctor and get a clear diagnosis as soon as possible. Thirdly, regular monitoring is not forgotten in the treatment of liver disease. Regular review of liver function, viral indicators, cancer indicators, liver imaging, etc., is still the process of “diagnosis”, which helps to dynamically grasp the effectiveness of treatment, disease progress and drug resistance information. Third, the treatment. The therapeutic effect and prognosis of drugs on liver disease vary greatly depending on the cause, condition and stage of the disease. 1, the cause: acute viral hepatitis can be self-healing; “treatment” of alcoholic hepatitis, the key to abstain from alcohol; drug-related liver injury mainly depends on drug withdrawal and liver protection. Autoimmune liver disease is not so fortunate, it is not yet possible to remove the cause and requires lifelong medication; chronic viral hepatitis, chronic hepatitis C can be cured, while most chronic hepatitis B requires long-term or even lifelong medication; 2, disease: the more severe the liver damage, the worse the treatment effect, the more difficult to recover. The most serious liver diseases are liver failure and liver cancer, both of which have a high mortality rate, with acute liver failure having a mortality rate of up to 90%; 3, stage of disease: chronic viral hepatitis, in those who have not developed cirrhosis, the effect of antiviral treatment is much better than those who have developed cirrhosis; even if they have developed cirrhosis, compared with compensated cirrhosis, the treatment effect of decompensated cirrhosis is much worse. If it has developed into liver cancer, especially advanced liver cancer, its treatment effect can be imagined. It is especially worth mentioning that patients with chronic hepatitis B must implement antiviral therapy at the right time and as early as possible. If the antiviral therapy is delayed until the point of cirrhosis, it will be difficult to stop the occurrence of liver cancer.