Most cases of leg pain are caused by muscle injury, varicose veins of the lower limbs, lumbar disc herniation and other reasons. 1. Muscle injury: If you have not been exercising for a long time, sudden exercise or prolonged exercise will cause the leg muscles to be overworked, resulting in lactic acid heap, or muscle injury, which will lead to the symptoms of leg soreness. 2. Varicose veins of the lower limbs: due to congenital causes or poor structure of venous valves leading to abnormal structure of venous walls and venous hypertension, resulting in varicose veins of the lower limbs, the patient will appear in the early stage of the symptoms of legs soreness, swelling, pain, usually accompanied by earthworm-like blood vessels protruding. 3. Herniated lumbar intervertebral disc: When lumbar intervertebral disc is herniated, it may compress the local nerve root, and the nerve conduction function will be abnormal, which will lead to the symptom of leg pain. Causes of leg pain are more causes, if the discomfort symptoms, should also go to the hospital in time to confirm the examination, under the guidance of professional physicians for targeted treatment.