The lumbar square muscle pain may be caused by physiological factors such as overwork, and may also be related to inflammation, strains and other pathological factors. 1. Physiological factors: usually if you often bend over and bear weight or strenuous exercise, easy to cause excessive fatigue of the lumbar muscle, resulting in excessive secretion of local metabolites, lactic acid buildup, resulting in lumbar muscle pain symptoms, generally adequate rest can be gradually relieved. 2. Inflammation: due to long-term weight bearing or bending activities in the lumbar region, resulting in chronic strain of the lumbar muscles, can lead to local muscle aseptic inflammation, such as fasciitis, etc., the stimulation of inflammation can trigger the symptoms of local muscle pain. 3. Strain: usually in the process of exercise, if the posture is not appropriate or excessive force caused by lumbar muscle strain, can produce lumbar muscle pain symptoms, and even affect the function of the movement, accompanied by localized pressure pain and swelling. If the symptoms of lumbar muscle pain continue to be unrelieved, it is recommended that the patient consult a hospital in time to clarify the cause of the disease and then carry out targeted treatment.