If you feel a vague pain in the left chest, it may be caused by the following aspects, and the general treatment method is different according to the cause.1. If it is a vague pain in the left chest, accompanied by chest tightness, palpitations, and the nature of the pain is like a crushing sensation, accompanied by dizziness, weakness of the limbs, cold sweat and other symptoms. It may be an acute heart disease, such as acute myocardial infarction, or angina pectoris. This situation should immediately go to the hospital to check the electrocardiogram, as well as blood troponin and other tests to confirm the diagnosis, if it is determined to be an acute myocardial infarction, should immediately give thrombolytic therapy, or vascular intervention to open up the coronary arteries to relieve symptoms. 2, ruled out the heart problems. The symptoms can slowly improve. 3, breast disease and herpes zoster may also cause chest pain.