The sternum is located just under the skin in the center of the anterior wall of the thorax, the upper part of the sternum is connected to the clavicle, and on both sides it is connected to seven pairs of rib cartilages. Clinically, it is often seen that there is sternal pain, the main pain site is the middle of the anterior sternal area, pain in the area above the raphe, the nature of the pain is more varied, the main causes are as follows. 1. Angina pectoris, myocardial infarction: this type of pain is usually paroxysmal swelling and boring pain, with a clear sense of chest urgency, and may pull or radiate to the shoulder, arm, etc., commonly found in middle-aged and elderly people. 2. Mediastinal diseases: mainly because the mediastinal tumor compresses the local nerves, thus causing persistent pain, and may be accompanied by dyspnea, dysphagia, hoarseness and other symptoms. 3. Esophageal diseases: such as esophagitis, which may also cause retrosternal pain. This pain is often aggravated when eating or hunger, and is accompanied by symptoms such as loss of appetite, acid reflux and belching. If sudden chest pain is unbearable, you should go to the hospital in time to avoid delay.