Hidden pain in the left side of the heart may be the manifestation of coronary heart disease, myocarditis, costochondritis, cardiac neurosis and other diseases. 1. Coronary heart disease: when coronary heart disease occurs, there will be coronary artery sclerosis and stenosis lesions, which may cause ischemic lesions of myocardial tissues, and the symptoms of vague pain in the left side of the heart may occur after physical exertion or physical activity, and the pain may worsen with the progress of the disease. 2. Myocarditis: when myocardial tissue inflammation occurs, local tissue congestion and edema may occur, which may also produce symptoms of vague pain in the left side of the heart. 3. Costochondritis: Inflammatory changes in the costochondral tissue of the left side of the chest often damage the nerves of the chest wall, which can also lead to vague pain in the left side of the heart. 4. Cardiac neurosis: some people experience left-sided chest pain due to psychoneuropsychological problems or neurological dysfunction, which is often accompanied by symptoms or emotions such as panic, shortness of breath, fatigue and anxiety. However, the examination generally cannot find a clear organic problem. If the symptoms of vague pain in the left side of the heart, may be seen in a variety of disease conditions, you can carry out cardiac ultrasound electrocardiogram, cardiac enzymes or chest magnetic resonance and other ancillary tests to clarify the diagnosis, if necessary, feasible coronary artery vascular CT imaging or coronary arteriography, for the cause of the corresponding treatment, in order to effectively relieve the pain.