Chest pain is a common symptom of discomfort in daily life, which is often trivialized, not timely to the hospital, and ultimately delayed, and even lead to death, so it should be taken seriously. The following are the common causes of chest pain: 1, chest wall lesions Chest pain caused by chest wall lesions is the most common type of chest pain, such as trauma to the chest wall, bacterial infections, viral infections, tumors and other causes of local skin, muscle, bone and nerve lesions. Common acute dermatitis, subcutaneous cellulitis, herpes zoster, painful obesity, myositis and dermatomyositis, epidemiological myalgia, cervical spondylosis, costal chondritis, bone tumors, intercostal neuritis, radicular neuralgia and so on. Among the common features: (1) the site of pain is fixed at the lesion, and there is obvious localized pressure pain. (2) Deep breathing, coughing, lifting arms, bending and other actions to make the thoracic activity pain aggravation. Lung and pleural lesions: Lung and visceral pleura are insensitive to pain sensation. Pneumonia, tuberculosis, lung abscess, lung infarction, etc., chest pain occurs due to lesions involving the wall layer. Lung cancer invading the bronchial wall and mural pleura can produce chest pain. Spontaneous pneumothorax produces sudden and severe pain due to adhesion tearing. Dry pleurisy causes chest pain due to the friction between the inflammation spreading to the dirty layer and the mural pleura. Massive pleural effusion and tension pneumothorax may cause chest pain due to compression of the mural pleura. The common features are: (1) Most often accompanied by cough or cough. (2) Chest pain is often aggravated by coughing and deep breathing, and other chest wall activities do not cause pain. (3) There is no localized pressure on the chest wall. Often accompanied by symptoms of primary diseases, X-ray examination can be found lesions. 3.Cardiovascular system diseases Common causes of angina pectoris, myocardial infarction and pericarditis. Angina pectoris, myocardial infarction, aortic valve disease and cardiomyopathy induced chest pain is due to myocardial ischemia. Pericarditis is due to lesions involving the pericardial wall layer below the level of the fifth rib and the adjacent pleura and pain, and its common features are: (1) Pain is mostly located in the retrosternal or precordial area, a few in the subxiphoid process, and may radiate to the left shoulder. (2) The pain is often aggravated by physical activity and improves after rest. 4. Mediastinal and esophageal lesions Less common, common causes include acute mediastinitis, mediastinal tumor, mediastinal emphysema, acute esophagitis, esophageal cancer and so on. Mediastinal diseases cause chest pain due to compression of tissues in the mediastinum, nerve or bone involvement and other factors. Esophageal diseases are mainly caused by inflammation or chemical irritants acting on the esophageal mucosa. The common features are: chest pain located behind the sternum, persistent progressive hidden pain or drilling pain, often radiating to other parts of the body. The pain is aggravated when swallowing, accompanied by dysphagia. 5, mold diaphragm lesions The cause of the disease can be in the diaphragm itself or caused by abdominal organ diseases, commonly diaphragmatic pleurisy, subphrenic abscess, diaphragmatic hernia, hepatitis, liver abscess, hepatocellular carcinoma and so on. Chest pain caused by diaphragmatic disease is due to irritation of the phrenic nerve. It is characterized by the fact that the pain is usually located in the thorax and the lower part of the sternum. When the center of diaphragm is stimulated, the pain can radiate to the shoulder and neck. 6, large vessel lesions, the main lesions of aortic coarctation, 90% of the aortic coarctation patients first symptom for the sudden onset of persistent, progressive aggravation of severe chest pain, stabbing, tearing or cutting pain, the patient can not tolerate, at this time, sweating profusely, taking nitroglycerin is ineffective. The disease is dangerous, rapid development, high mortality.