The main causes of leg pain are the following: 1. Knee chondromalacia is seen in young patients, especially pain after strenuous exercise, you can take oral glucosamine sulfate and meloxicam. 2. Myofasciitis, which can occur at multiple ages, is mainly manifested by muscle pain in the thigh or calf, and the activity is affected and aggravated by cold, you can take meloxicam and bruxism. 3. This is due to the pain and numbness of the lower limbs caused by the sciatic nerve being compressed in the process of passing through the pear-shaped muscle, which can be treated with oral methylcobalamin to nourish the nerve. 4, ligament strain, usually with a clear history of trauma, pain occurs when a certain action is performed after the injury, mainly rest, and can be treated with oral meloxicam and paralysis capsule.