Pain inside the chest may be caused by trauma, coronary heart disease, aortic coarctation, pulmonary embolism, pneumothorax, pleurisy, esophagitis and so on. 1. Trauma: the chest is subjected to violent impact, extrusion, falling, concussion and other traumatic injuries lead to the displacement of organs and tissues in the chest cavity, injury and other changes, so it will be pain inside the chest. 2. Coronary heart disease: atherosclerosis of coronary arteries leads to narrowing of the lumen, limitation of blood supply to the heart, ischemia of cardiac myocytes and pain in the chest. 3. Aortic dissection: long-term high blood pressure, old age and other causes of aortic brittleness increase, in the blood flow under the impact of the arterial lining tear, the chest inside the sudden sharp tear-like pain. 4. Pulmonary embolism: the pulmonary artery and its branch thrombus embolism leads to infarction of lung tissue and pain inside the chest. 5. Pneumothorax: outside gas enters the pleural cavity through the rupture opening on the chest wall or lung surface, resulting in increased pressure in the pleural cavity and pain inside the chest. 6. Pleurisy: Bacteria, tuberculosis, tumor, autoimmune and other factors lead to inflammatory changes such as pleural fluid exudation, adhesion and so on, so the inside of the chest hurts. 7. Esophagitis: gastric acid reflux into the esophagus leads to corrosion of the esophageal mucosa, so there will be pain in the chest, accompanied by dysphagia and other symptoms. Chest pain may be related to a variety of factors, it is recommended to consult a doctor for a clear diagnosis.