Low LDL is seen in causes such as no beta-lipoproteinemia, hyperthyroidism, malabsorption, etc. Choose the appropriate drug treatment according to the actual situation. 1. No beta-lipoproteinemia: early supplementation of fat-soluble vitamin C can slow down the progress of the disease and improve the symptoms. 2. Hyperthyroidism: take medication anti-thyroid drugs such as propoxyphene, methimazole, etc., 131I treatment, and surgical treatment is feasible when there are surgical indications such as compression. 3. Malabsorption: supplemental vitamins, iron, minerals, etc., while paying attention to the regulation of electrolyte balance. 4. Cirrhosis of liver: protect and improve liver function, oral deoxycholic acid. 5. Low-fat diet, exercise: adjust factors, increase fat intake, control moderate exercise. Low-density lipoprotein is generally not life-threatening if there is no underlying disease, but if it is caused by the underlying disease, the underlying disease should be treated in a timely manner.