Cardiovascular disease is a general term for cardiovascular and cerebrovascular diseases. It generally refers to ischemic or hemorrhagic diseases in the heart, brain and body tissues caused by hyperlipidemia, blood viscosity, atherosclerosis, hypertension, etc. Cardiovascular and cerebrovascular disease is a common disease that seriously threatens the health of humans, especially middle-aged and elderly people over 50 years old. It is characterized by high prevalence, high disability and high mortality rates.