The main causes of pain in the heart are related to cardiac diseases, lung diseases, digestive diseases and neurosis. It is necessary to combine with other symptoms and improve the examination to clarify the cause. 1. Heart disease: If there is heart disease, such as pericarditis, myocarditis or coronary heart disease, it is easy to produce symptoms of vague pain in the heart. 2. Lung lesions: If there are abnormal lesions in the left side of the lungs, such as lung cancer or pneumonia, they will easily invade the lung parenchyma, which will cause vague pain in the heart position, and even accompanied by abnormal respiratory manifestations. 3. Digestive system diseases: if there are digestive system diseases, such as gastroesophageal reflux, it is easy to cause certain stimulation to the local smooth muscle, so it will produce symptoms of hidden pain in the heart position. 4. Neurosis: if there is a neurasthenia or psychosomatic diseases, it is easy to trigger the physical symptoms of neurosis, and then the symptoms of hidden pain in the heart position, not caused by the body’s organic lesions. If the pain is more intense and lasts for a long time, you need to seek medical treatment as soon as possible, for example, you can first go to the cardiovascular internal medicine examination, so as not to delay the condition.