Sometimes vague pain in chest may be related to pleurisy, angina, bronchitis, tumor and so on. 1. Pleurisy: the causes of pleurisy are complicated, such as autoimmune diseases, infections, tumors and so on may cause pleurisy, and there will be vague pain in the chest, chest tightness, dyspnea and other symptoms. 2. Angina pectoris: myocardial ischemia and hypoxia can cause angina pectoris, which can be characterized by vague chest pain, radiating pain to the precordial area, chest tightness and other symptoms. 3. Bronchitis: Bronchitis may cause vague chest pain if the cough is severe and has greater stimulation to the lungs. 4. Tumor: Tumor such as lung cancer can cause symptoms of chest pain, which needs specific examination to be clear. It is recommended to go to the hospital in time to complete the relevant examinations and find out the cause of chest pain under the guidance of doctors.