I. What is chest pain The varying degrees of occupying or persistent pain in the chest caused by chest or chest wall diseases is an extremely common clinical symptom in daily life. Why does chest pain exist or pass through several important organs in the chest, containing a wealth of blood vessels and nerves. The most important cardiopulmonary system of human body exists here. Because the chest is a part that contains several important organs and blood vessels and nerves, there are many causes of chest pain. The causes of chest pain can be broadly classified into the following six categories: 1. cardiogenic pain coronary heart disease, valve/outflow tract disease, myocarditis, pericarditis; 2. vascular pain aortic coarctation aneurysm, pulmonary embolism; 3. pulmonary pain pleural irritation caused by inflammation of lung infection; 4. gastrointestinal pain reflux esophagitis, hiatal hernia, peptic ulcer, pancreatitis, gastric mucosal tear; 5. superficial chest pain chondromalacia, intercostal muscle strains, chest wall tumor pain, herpes zoster, cervicothoracic spinal cord lesions; 6, other sources of pain plant nerve dysfunction. Third, what kind of chest pain is the most dangerous: Among the many chest pains, cardiogenic chest pain and vascular chest pain are the most dangerous and can cause life-threatening in serious cases. Because people at rest or at night do not need increased blood supply like when they are active, chest pain at this time often indicates that there may be vasospasm on the basis of coronary stenosis and new-onset angina, and untimely treatment can lead to heart attack. Chest pain symptoms worsen. People with previous angina should also be highly alert to the risk of heart attack if the symptoms of chest pain have gradually worsened in the past month, or if the chest pain is more frequent, heavier, more extensive and longer in duration. In addition, if the chest pain cannot be effectively relieved within 15 to 20 minutes after sublingual nitroglycerin is administered during an angina attack, one should also be alert to a heart attack. Chest pain with no obvious cause. If you have chest pain in a quiet state with no obvious cause, and if it is accompanied by profuse sweating, vomiting and nausea, you should seek medical attention promptly. Sudden heartburn and tightness. If you have never experienced chest tightness, weakness, or panic before, or if you experience panic or shortness of breath during activity or if your symptoms worsen, you should seek medical attention immediately. Sudden onset of chest pain that is difficult to stop and pain that is unbearable. Acute onset of chest pain is often rapid, unbearable, and difficult to be relieved by rest or medication after the attack. Because of the many causes of chest pain, dangerous chest pain should be identified early and treated as soon as possible, while non-dangerous chest pain should not be overly stressed.