Chest pain when the patient is on his side, the common clinical reasons are mainly the following: First, chest muscle strains can cause local soft tissue injury, side when the muscle continues to be stressed, there can be local pain symptoms. At this time, it is recommended that patients try to take the lying position, to avoid muscle contraction, at the same time can be given appropriate local massage physiotherapy, hot towel wet compresses. Improve the blood circulation of the injured place, promote the faster recovery of the injured tissue, so as to reduce the pain symptoms. Second, if the patient’s rib fracture on one side, when the side can make the rib fracture continued pressure, the patient appeared chest pain symptoms. At this time, the patient needs to improve the CT or X-ray examination of the ribs, to clarify the specific situation of the rib fracture, and if necessary, to give local immobilization. At the same time, oral pain relief, diclofenac sodium capsules and other drugs to reduce the pain symptoms, to promote the faster recovery of local injury.