Sudden chest pain may be caused by cardiovascular diseases, respiratory diseases, or chest wall diseases. 1. Cardiovascular diseases can cause sudden chest pain, commonly seen in angina attack, acute myocardial infarction, pain is often limited to the left anterior chest, can cause back, left upper limb radiating pain, accompanied by chest tightness, panic and other discomforts, often occurs in the middle-aged and elderly people with diabetes, hypertension. 2. Respiratory diseases may also cause sudden chest pain, such as pneumonia, pleurisy, pneumothorax, pulmonary embolism, which is often accompanied by fever, cough, chest tightness, dyspnea and other symptoms. 3. Chest wall diseases can also cause sudden chest pain, such as rib and sternum fracture, herpes zoster, chest muscle spasm, etc. It is necessary to observe whether there is local redness, swelling, skin breakage, etc. If fracture is considered, it is necessary to further improve the chest CT examination. Give appropriate treatment after clarifying the cause of the disease. If there is sudden chest pain, persistent or severe symptoms, it is recommended to go to the hospital as soon as possible for treatment.