Chest pain has many causes, usually related to physiological factors, myocardial infarction, costochondritis. 1. Physiological factors: Chest pain may occur suddenly during strenuous exercise, such as running, jumping rope, riding a bicycle, etc., which may cause sudden chest pain. It is a normal manifestation, no special treatment is needed, and the symptoms will disappear gradually after stopping the activity. 2. Myocardial infarction: this disease is mainly due to the blockage of blood vessels in the heart, resulting in myocardial ischemia, hypoxia caused by necrosis of myocardial cells will release inflammatory substances, which will cause chest pain, and the symptoms will be significantly aggravated after activities. 3. Costal chondritis: usually associated with infection with bacteria and viruses, pathogens repeatedly stimulate the costal cartilage, easy to cause costal chondromalacia, the symptoms will radiate to the chest, shoulder blade. In addition to the above factors, forked chest pain may also be related to lung disease, pleurisy and other diseases, and should be consulted as soon as possible to analyze the cause and then standardize the treatment.