Vague pain in the back of the left chest should be treated according to the cause of the symptoms, which may be caused by overwork, or chest organ diseases such as coronary heart disease, reflux esophagitis, lung inflammation and tumors. Treatments include general treatment, medication, radiotherapy, surgery and so on. 1. Muscle strain caused by overexertion will cause vague pain in the back of the left chest and other symptoms, at this time, pay attention to rest and avoid exertion. 2. Coronary heart disease caused by myocardial ischemia, there may be vague pain in the back, and aggravated by exertion, can be relieved by resting, can be taken to inhibit platelet aggregation of drugs, such as aspirin, lipid-lowering drugs, statins, expansion of coronary artery drugs, nitroglycerin and other therapies. 3. Reflux esophagitis can have hidden pain in the left chest and back, and accompanied by acid reflux and other symptoms, can take drugs to inhibit gastric acid such as omeprazole, cimetidine and other drugs. 4. Inflammation of the lungs, such as bronchitis, bronchiectasis, etc., can be accompanied by vague pain in the back, and coughing, shortness of breath, dyspnea, fever and other symptoms can be taken antibacterial drugs such as amoxicillin, cephradine and so on. 5. Left chest and back pain can also be seen in chest tumors, malignant tumors are commonly seen in lung cancer and esophageal cancer in advanced stage, benign tumors are commonly seen in mediastinal tumors, timely follow the doctor’s instruction of radiotherapy and surgical treatment and so on. Left chest and back pain can also be caused by other reasons, after excluding the cause of fatigue, go to the hospital in time to consult the doctor and get a clear cause of the disease and treat it in time. All of the above drugs should be used under the guidance of a doctor to avoid adverse reactions.