Sudden heart pain and congestion may be angina pectoris, myocardial infarction, pulmonary embolism, myocarditis, etc., should be based on a comprehensive analysis of the specific circumstances. 1. angina pectoris, myocardial infarction: the two have the same pathological mechanism, mainly due to coronary atherosclerosis caused by coronary artery stenosis, distal myocardial energy metabolism is abnormal, ischemia and hypoxia produces acid, stimulate the coronary artery to produce pain, chest tightness, blockage. When coronary artery stenosis or partial occlusion, blood flow is reduced, oxygen supply and demand is relatively balanced, for stable angina pectoris; coronary artery plaques are unstable in nature, which can easily cause platelet aggregation and complicate thrombosis, for unstable angina pectoris or myocardial infarction. 2. Pulmonary embolism: mainly caused by venous thrombosis of the lower extremities and other etiological factors, thrombus dislodgement with the blood circulation, resulting in sudden obstruction of the pulmonary artery, pulmonary artery pressure increases, pain in the mouth of the heart, stuffy and congested, accompanied by dyspnea and hemoptysis, severe shock and loss of consciousness can occur. 3. Myocarditis: the disease is mostly caused by the history of upper respiratory tract infections, heartburn, stuffy feeling, sometimes accompanied by dyspnea, cough, cough sputum, fever. When there is a sudden pain in the mouth of the heart, not according to the symptoms of their own diagnosis and treatment, it is recommended to go to the hospital in a timely manner, under the doctor’s comprehensive analysis, further treatment.