Chest tightness, chest tightness and hidden pain should be alert to heart disease, such as angina pectoris, heart attack, etc., and may also be caused by pulmonary embolism. 1. Angina pectoris: this disease is caused by myocardial ischemia and hypoxia, the pain can radiate to the left upper extremity, the duration is relatively short, within 20 minutes, you can contain nitroglycerin and other drugs to relieve pain. 2. Heart attack: also called myocardial infarction, myocardial necrosis caused by myocardial ischemia and hypoxia, ECG, coronary angiography and other tests, thrombolytic therapy is needed, or interventional surgery, if the area of obstruction is large, the coronary artery is too narrow and need to be put on the stent or cardiac bypass graft. 3. Pulmonary embolism: it is a disease caused by endogenous or exogenous embolus blocking the pulmonary artery or its branches, which causes the dysfunction of the pulmonary circulation and the right heart, and is often caused by the dislodgement of thrombus from the deep veins of the lower extremities, and requires thrombolytic therapy or interventional surgery after the examination of CT of the lungs and the coagulation function. It is recommended to consult a doctor in time to avoid life-threatening situations.