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 causes are related to medication, immune dysfunction, alcoholism, excessive fat deposits in liver tissue, and congenital liver defects. Dr. Miao is here to talk about liver diseases, mainly about prevention, diagnosis and treatment. 1, a say 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 developing good lifestyle habits. 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-protected nor medically protected, such as autoimmune liver disease and hereditary liver disease, early detection and early treatment can prevent the development of serious and advanced liver disease, which also belongs to prevention. 2. Secondly, say diagnosis. At least three aspects should be included: first, timely detection of liver disease in the asymptomatic period. The onset of many liver diseases is very 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 being 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. 3.Three said treatment. The treatment effect and prognosis of drugs on liver disease vary greatly depending on the cause, disease and disease stage. (1) Etiology. Acute viral hepatitis can be self-healing; the key to “treating” alcoholic hepatitis is to stop drinking; drug-related liver injury mainly depends on drug withdrawal and liver protection. Autoimmune liver disease is less fortunate, as the cause cannot be removed and requires lifelong medication; chronic viral hepatitis can be cured with chronic hepatitis C, while most chronic hepatitis B requires long-term or even lifelong medication. (2) Condition. The more severe the liver damage, the worse the treatment effect and the more difficult it is to recover. The most serious liver diseases are liver failure and liver cancer, both of which have high mortality rates, including acute liver failure, which can be as high as 90%! (3) Duration 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, the treatment effect of decompensated cirrhosis is much worse than compensated cirrhosis; if they have developed hepatocellular carcinoma, especially late stage hepatocellular carcinoma, the treatment effect can be imagined. It is especially worth mentioning that patients with chronic hepatitis B must implement antiviral treatment at the right time and as early as possible. If the antiviral treatment is delayed to the point of cirrhosis, it will be difficult to stop the occurrence of liver cancer.