There are many causes of chest tightness, commonly caused by heart, lung, esophageal and stomach diseases, etc. The specific treatment should be sought at a specialized hospital. When you find out that you have chest tightness, you should pay attention to the cause of chest tightness, its duration, and the reason for relief, and make a judgment based on different situations and accompanying symptoms and past medical history, firstly, whether you should go to the hospital immediately, and secondly, which department you should go to the hospital to see a doctor. The most common causes of chest tightness are heart disease and lung disease. 1, heart disease: the most common cause of heart disease that causes chest tightness and chest pain is coronary heart disease, due to myocardial ischemia and hypoxia caused by narrowing or occlusion of the coronary arteries. Mostly related to exertion, emotional excitement, full meals, etc., rest or nitroglycerin containing can be relieved. Cardiac enzymes, troponin, electrocardiogram, echocardiogram, coronary CT, cardiac MRI or coronary angiography can further diagnose heart disease problems. Second, myocarditis and pericarditis can also cause chest tightness and chest pain. Viral myocarditis may be preceded by a history of upper respiratory tract infection, and arrhythmias are common. The chest pain symptoms of pericarditis are mostly related to breathing, coughing, body position or swallowing. Cardiology should be listed for any related conditions. 2, lung and pleural diseases: more common chronic bronchitis, chronic obstructive pulmonary disease, lung infection, spontaneous pneumothorax, etc. Chronic bronchitis and chronic obstructive pulmonary disease often aggravate chest tightness and breath-holding due to infection, and spontaneous pneumothorax often has tearing-like pain when it first occurs. Pain due to pulmonary causes is mostly aggravated by breathing or coughing. The diagnosis can be further confirmed by chest X-ray, lung CT, bronchoscopy, etc. If there is a related condition, you should hang up the respiratory medicine department. 3, psychosomatic factors: cardiac neurosis and psychological factors can also cause similar chest tightness. Cardiac neurosis is mostly seen in women aged 20 to 40 years old, especially menopausal women. Pathologically there is no evidence of organic heart disease. The symptoms are varied and typically resemble those of an acute heart attack, including chest tightness, panic, breathlessness, and tightness in the precordial region. The patient may be seen further in a cardiosomatic medicine clinic. Cardiac neurosis and psychological factors can be considered in cases where no clear cause can be found after careful examination.