Leg pain when walking may be related to leg trauma, strain injury, lumbar disc herniation and other reasons. 1. leg trauma: lower limb muscle sprains, contusions or severe lower limb trauma, causing fractures, there will be leg pain when walking. 2. Strain: If the patient suffers from strenuous exercise or prolonged chronic weight-bearing activities of the lower limbs, resulting in muscle strain and accumulation of lactic acid, the symptoms of leg pain on walking will appear. 3. Herniated lumbar intervertebral disc: due to the herniated intervertebral disc tissue compresses the nerve root in the current stage, resulting in leg pain when walking. The cause of leg pain when walking is also related to muscle soft tissue lesions, joint lesions and other causes, it is recommended that patients should go to a regular hospital in time to identify the cause of the disease, under the guidance of the doctor for treatment.