Blood viscosity is not a disease, many kinds of diseases such as atherosclerosis, cerebral thrombosis, myocardial infarction, hypertension and chronic liver and kidney diseases are related to blood viscosity, when the blood viscosity will slow down the blood flow, the body can not get oxygen and nutrients normally. If too many red blood cells age and harden, it will also increase the blood viscosity, and even blood clotting will cause blood vessel blockage and myocardial infarction. There are many factors that affect blood viscosity, such as craving for fatty foods, drinking too little water and excessive sweating. Blood viscosity is often in dynamic change, if middle-aged and elderly people often have blood viscosity phenomenon, they should be given anti-platelet coagulation treatment, and at the same time change the lifestyle, such as a light diet, appropriate aerobic activities, and take lipid-lowering drugs such as simvastatin in daily health care.