Pain on both sides of the chest is considered to be caused by trauma, costochondritis and pleurisy. 1. Trauma: when the patient suffers from external violent impact or accidental fall, it may lead to fracture of the chest bones, which will easily lead to pain on both sides of the chest. 2. Costochondritis: Costochondritis is a kind of non-specific inflammation, partly due to infectious factors. It is mainly characterized by pain with hidden pain and swelling, and there may also be some redness, swelling and fever on the skin surface. 3. Pleurisy: When the chest is infected by bacteria, it may cause inflammation of the pleura, which causes pain when the wall pleura and the dirty pleura rub against each other when breathing. Pain on both sides of the chest may also be caused by pneumothorax, intercostal neuritis, etc. Patients should go to the thoracic surgery department of the hospital as soon as possible for examination to clarify the cause of the disease and actively treat it.