There are many reasons for the pain on the right side of the chest, and the common causes are intercostal neuralgia, spontaneous pneumothorax and chronic hepatitis. 1. Intercostal neuralgia: mostly seen after herpes zoster infection, the virus lurks in the ganglion, and when the body’s immunity is low, the virus multiplies, causing chest pain along the intercostal space, and the pain is mostly stinging and burning. 2. Spontaneous pneumothorax: mostly seen in people with underlying lung lesions, most of them have a rapid onset, suddenly feel chest pain on one side, the pain is tearing-like. It can be accompanied by irritating cough, and the pain is aggravated by coughing or breathing. 3. Chronic hepatitis: pain caused by chronic hepatitis mostly occurs in the right lower chest, mostly hidden pain. In addition to the above reasons, the causes of pain on the right side of the chest are pleural effusion, pleurisy, and if it is acute pain on the right side of the chest, it should also be alert to myocardial infarction, aortic coarctation, pulmonary embolism, etc. If the above symptoms occur, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give the targeted treatment or therapy.