The main causes of pain below the heart are bone or muscle disorders, stomach disorders, and heart disorders. Sometimes trauma, overexertion, or anxiety can also cause pain below the heart. Most of the heart is located in the left side of the chest cavity, and the tissues under the heart include the diaphragm, the surrounding lung tissues or chest wall tissues, as well as the abdominal organs such as the stomach. When there is a vague pain under the heart, it is often due to the lesions in the above areas. 1. Bone or muscle disease: when the bone injury or muscle tissue strain, or intercostal neuritis caused by herpes zoster, etc., can lead to vague pain below the heart. 2. Stomach disorders: mainly gastroesophageal reflux disease, chronic superficial gastritis, chronic atrophic gastritis, and gastric ulcer. When the patient’s stomach pain attacks, it may be manifested as a vague pain in the area below the heart. 3. Heart disease: mainly coronary heart disease, myocardial injury, arrhythmia, etc. These diseases may manifest as vague pain in the precordial area or below the heart. There are many other causes of pain below the heart, such as trauma, overwork, anxiety and depression, tumors in the relevant areas, etc., which may also lead to pain below the heart. When the symptoms are obvious and recurring, the patient should go to the hospital in time to avoid delaying the condition.