Total cholesterol of 5.66 mmol/L is in the borderline elevated range and is usually not serious. Depending on the instrument used, the level of total serum cholesterol varies more or less according to the normal range indicated on the test, which is generally between 2.8 and 5.2 mmol/L, while 5.66 mmol/L belongs to the range of borderline elevation. If there is no associated disease, after a period of lifestyle regulation, there is a greater chance of returning to the normal range. Attention to lifestyle modification and long-term control will not usually result in serious consequences. High total cholesterol requires comprehensive regulation, mainly through diet, exercise and medication. In daily life, it is necessary to improve the lifestyle and control the total calories of the diet, avoid eating some greasy food, and limit the intake of salt. You can also increase some exercise, such as jogging, playing tai chi, etc., which can improve the situation of high total cholesterol to a certain extent. If the total cholesterol is high for a long time, or accompanied by obvious discomfort, you can follow the doctor’s instructions to take some drugs to reduce total cholesterol, common drugs are statin lipid-lowering drugs, such as atorvastatin calcium tablets, simvastatin calcium tablets, etc., the use of drugs should follow the doctor’s instructions, do not blindly use drugs, so as not to cause discomfort.