Muscle pain in the chest wall may have a physiologic cause, such as muscle strain. It may also be pathologic, such as myofibrillar histiocytosis, rib lesions, and so on. You should consult a doctor in time to find out the cause of the disease. 1. Physiological causes: muscle strain is a kind of after-effects after long-term use of muscles, it may also be caused by environmental factors caused by muscle cold, but most of the cases are caused by the patient himself to carry out some forceful exercise, so that the muscles suffered acute or chronic fatigue injury. 2. Pathological causes (1) Myofibrillitis: because of pathological changes in the fascia and cause myofascial discomfort. Generally, it is related to the strain of prolonged incorrect posture, and may also be related to the external adverse stimuli such as cold and humid environment factors. (2) Rib lesions: common lesions include costochondritis, which refers to inflammatory lesions occurring in the area of the rib cartilage, and may be caused by trauma, chronic strain or infection with pathogenic bacteria. If physiological causes are ruled out, the patient should consult a doctor in time to identify the specific cause and, if necessary, undergo appropriate treatment.