Symptoms of myocardial ischemia include discomfort in the precordial region, nausea, and fatigue, etc. Symptoms of insufficient blood supply to the brain include numbness of the limbs, convulsions, irritability, irritability, and impaired consciousness. Myocardial ischemia is mainly caused by insufficient blood and oxygen supply to the myocardium from the coronary arteries, and some patients do not have any obvious discomfort, while some others will show discomfort in the precordial region, such as chest tightness, chest pain, etc., and in severe cases, the pain can be radiated to the left shoulder and the epigastric region. There may also be nausea, vomiting, sweating, weakness and other symptoms. Cerebral insufficiency of blood supply is mainly caused by the inability of the blood in the brain to circulate normally or the weakening of the heart’s pumping ability. Acute cerebral insufficiency of blood supply patients will have symptoms such as numbness of one side of the limbs, impaired consciousness, convulsions, blurred vision, and so on. Patients with chronic cerebral blood supply insufficiency will have symptoms such as dizziness, headache, tinnitus, nausea, vomiting, irritability, irritability, and lack of concentration. It is recommended that patients with appealing symptoms seek medical treatment in time to avoid danger.