Possible causes of sudden heart pain include: coronary heart disease, acute pericarditis, myocarditis, pulmonary embolism and so on. 1. Coronary heart disease: including stable angina, unstable angina, acute myocardial infarction and so on. The pain is characterized by acute and sudden chest pain, mostly located in the precordial area or the back of the sternum, with pressure or tightness, and cardiogenic shock can occur in severe cases. 2. Acute pericarditis: patients with acute pericarditis will also experience anterior precordial or retrosternal pain, which is sharp in nature and can radiate to the neck, left shoulder and left arm. The pain is aggravated by coughing and deep breathing. 3. Myocarditis: Myocarditis is mostly caused by viral infections, and common viruses include coxsackie virus, human herpesvirus, adenovirus and so on. Before the onset of the disease, there are many signs of viral infection, such as fever, fatigue, muscle pain, etc.. Subsequently, heart-related symptoms such as palpitations (rapid heartbeat, often accompanied by panic), chest pain, dyspnea, etc. can occur, and in severe cases, fainting or even sudden death can be caused. 4. Pulmonary embolism: pulmonary embolism is mostly secondary to deep vein thrombosis in the lower limbs, and the venous thrombus can return to the heart with the venous blood after dislodging, blocking the branches of the pulmonary artery or even the main trunk, and the patient can have sudden chest pain, dyspnea, hemoptysis and other manifestations, which can lead to sudden death in severe cases. In addition to the above diseases, pneumothorax, aortic valve stenosis, diaphragmatic hernia and so on can appear in the heart part of the sudden pain, it is recommended that the patient immediately go to the hospital, timely and clear the cause of the disease, as soon as possible to be treated accordingly, and do not delay in order not to cause adverse consequences.