There are many causes of chest pain, such as angina pectoris, acute myocardial infarction, intercostal neuralgia and pulmonary infarction. The occurrence of chest pain needs timely medical treatment, do not self-diagnosis to avoid delaying the condition. 1. Angina pectoris: the pain mainly comes from the pressure and tightness behind the sternum, which radiates to the left shoulder and the left upper limb, and in serious cases, the right arm and the right chest will also have pain, which lasts for 2-5 minutes. 2. Acute myocardial infarction: the chest pain caused by this disease is similar to angina pectoris, but the pain lasts for a longer period of time, up to half an hour or so, accompanied by nausea, vomiting, profuse sweating, and a strong sense of near death. 3. Intercostal neuralgia: The disease presents paroxysmal burning or stabbing pain. Cold and flu are common triggers of intercostal neuralgia. 4. Lung infarction: the disease manifests as sudden severe stabbing pain or colic pain, accompanied by dyspnea and cyanosis. The occurrence of chest pain needs timely medical treatment, clear diagnosis and symptomatic treatment, do not self-diagnosis to avoid delaying the condition.