What to do when a man has a vague pain in his chest should be based on the nature of the pain, the frequency of attacks, duration and accompanying symptoms to make a judgment, and further auxiliary examination to make a clear diagnosis before formulating a treatment method. The right and left chest may involve the tissues and organs of the heart, lungs, mammary glands, rib cartilage and so on. 1, heart: the more common is coronary heart disease. Episodic chest pain is characteristic of coronary heart disease. The typical site of pain is behind the sternum. However, the pain may also radiate to the right and left chest. The nature of the pain is typically pressure-like, mostly accompanied by obvious chest tightness, and some patients have a sense of dying, often forcing the patient to stop activities immediately. Symptomatic episodes are often triggered, such as walking up stairs, fast walking, exertion, full stomach, cold, emotional excitement, etc. Symptoms can be relieved by quiet rest. Other symptoms such as myocarditis, pericarditis can also cause pain in the left chest. 2, lung: more common lung infection, spontaneous pneumothorax, pleurisy, lung cancer and so on. Spontaneous pneumothorax often has tearing pain at the beginning. Lung cancer is persistent and severe pain. The pain caused by lungs is mostly aggravated by breathing or coughing. Breast: Male breast cancer may cause chest pain. Painless lump can be felt in the early stage of breast cancer, and localized orange peel-like skin changes can be seen in the late stage. 4.Others: costochondritis may cause chest pain with localized pressure pain but no redness or swelling; herpes zoster pain is distributed along one side of the intercostal nerve with severe pain, and the pain does not exceed the midline of the body surface. After the functional examination still failed to find organic lesions, then need to consider cardiac neurosis. When a man has a vague pain in the left and right chest, if the symptoms and episodes of chest pain are characterized by more suspicion of heart disease and lung disease, both need to go to the emergency room immediately to avoid life-threatening situations. If the chest pain is suspected to be breast or chondritis, you can go to the general surgery department.