Deep breathing, manifested as pain in the lower left chest, first of all, should be carried out chest X-ray examination, because some patients are due to chest infection, especially pleurisy early stage, the pain is obvious when deep breathing, the patient will also be accompanied by fever, cough as well as coughing up sputum, after the diagnosis should be systematic anti-infective treatment, you can choose to choose the broad-spectrum penicillin sodium intravenous input, and at the same time, appropriate respiratory function exercise, and increase dietary exercise. Increase dietary nutrition, can promote the recovery of the disease. Some patients are caused by heart disease, especially elderly patients with a past history of hypertension and other diseases. The left chest pain, not except myocardial ischemia, should first carry out electrocardiogram, if clear, can choose nitrate drugs orally, in normal times should pay attention to dietary regulation, low-salt, low-fat diet, eat more fresh vegetables, fruits, can be appropriate for aerobic exercise, regular review.