There are three possibilities for men with left-sided chest pain: first, costal chondritis, a sterile inflammation of the ribs, mostly after cold or exertion, manifested as pain distributed along the rib arch, stabbing pain, pain can be obvious oral ibuprofen capsules, local topical application of Fotarim, pay attention to rest, avoid eating spicy and stimulating food. Second, cardiac system diseases, common coronary heart disease or myocardial infarction, the pain is more intense can be accompanied by posterior back radiating pain, is squeezing change, oral nitroglycerin or isosorbide nitrate can be alleviated, should be actively to the regular hospital cardiology interventional surgery treatment. Third, lung infection, when the lung infection spread to the dirty pleura pleurisy, manifested as chest pain, pain aggravated by deep breathing, can be relieved by rest, cephalosporins or moxifloxacin anti-infective treatment, once the chest pain does not adapt to go to the regular hospital to clarify the cause of pain and active treatment.