Most of the back and leg soreness is seen after high-intensity physical exercise, most of the large muscle soreness is due to the lactic acid in the exercise process can not be metabolized in time, so that the muscle soreness, most of the patients in the post-running, sit-ups, stomping, exercise involved in the corresponding muscles, so as to appear soreness. It is necessary to exclude lumbar disc herniation, lumbar spinal stenosis, lumbar spondylolisthesis on the nerve root or dural sac compression, thus appearing leg nerve symptoms, compression of the innervation area, manifested as numbness and radiating pain. With the progression of the disease will appear in the late stage of muscle atrophy, muscle weakness will also appear soreness, can also be seen in patients with myofibrositis, most of which is related to cold, trauma, muscle strain caused by muscle inflammation, in the morning after waking up will be accompanied by muscle soreness, morning stiffness.