Male patients with vague pain in the left side of the chest should first have an electrocardiogram because for middle-aged and elderly patients with underlying hypertension, diabetes mellitus or elevated lipids can develop myocardial ischemia, that is, prolonged coronary atherosclerosis or even plaque formation, leading to coronary stenosis or spasm, inducing myocardial ischemia and chest pain, which can also radiate to the back of the left shoulder. Oral nitrate drugs should be taken in time, and the symptoms can be improved. You should pay attention to low-salt and low-fat diet, no strenuous activities, appropriate application of secondary prevention drugs for coronary heart disease, you can choose aspirin and metoprolol, monitor the changes of blood pressure and heart rate, regularly review the electrocardiogram and color ultrasound examination of the heart, and stay away from the environment of smoking and alcohol.