Prolonged chest pain may be caused by a variety of diseases such as angina attack of coronary heart disease, lung disease, breast disease and so on. 1. Angina attack of coronary heart disease: patients with coronary heart disease can have pain in the chest area after exertion, emotional excitement, satiety, etc., mainly because of insufficient blood supply to the coronary arteries, myocardial oxygen consumption increased by the disease. 2. Lung diseases: such as pulmonary occupational lesions, can appear long-term chest pain, some patients may be accompanied by cough, hemoptysis and other symptoms; such as pulmonary embolism, small thrombus embolism pulmonary vascularization, can be only chest pain, chest tightness and discomfort, severe cases of dyspnea. 3. Breast diseases: breast cancer causes long-term chest pain, usually seen in the late stage of breast cancer, showing obvious breast swelling and pain, accompanied by nipple inversion and other phenomena; mammary hyperplasia causes long-term chest pain, mainly because of the local hyperplasia will stimulate the chest, when walking or exercise hyperplasia parts will appear tingling, swelling, etc., the symptom is obvious before menstruation, and a little bit relieved after menstruation. If you have prolonged chest pain, it is recommended that you go to the hospital in time to avoid delaying your condition.