The six major symptoms of myocardial ischemia are chest tightness, shortness of breath, chest pain, dyspnea, panic, and weakness, etc. They are generally most common in the elderly and patients with existing heart diseases, because as we age, the degree of atherosclerosis increases and subsequently myocardial ischemia occurs, leading to obvious clinical symptoms. It is important to take care of rest and to review ECG and echocardiogram regularly. When the above discomfort occurs, take heart-protective drugs, such as angiotensin-converting enzyme inhibitors, and drugs to expand coronary circulation and improve blood supply to the heart, such as enalapril maleate, compound danshin drops, isosorbide mononitrate, aspirin enteric-coated tablets, atorvastatin calcium capsules, and other drugs in time.