The right leg pain can be caused by lumbar disc herniation or lumbar spondylolisthesis, but it can also be caused by fasciitis, pyriformis syndrome and muscle strain. 1. Lumbar disc herniation: After the onset of the disease, it usually leads to nerve compression, which causes pain or numbness in the right leg, and in severe cases, it is likely to have limited activities. 2. Lumbar spondylolisthesis: Lumbar spondylolisthesis can also lead to localized nerve compression, thus causing pain in the right leg, and the symptoms of pain will be significantly aggravated when walking. 3. Fasciitis: Fasciitis is usually acute or chronic aseptic inflammation, and it is a kind of aseptic inflammation of muscle and soft tissue, which usually causes pain after the onset of symptoms. 4. Piriformis syndrome: Piriformis syndrome may cause the sciatic nerve to be compressed, resulting in pain and limited movement of the right leg. 5. Muscle strain: A muscle strain in the right leg can lead to localized swelling and congestion, and in severe cases, it can also lead to muscle tearing and cause symptoms of right leg pain. The cause of right leg pain needs to be clarified through imaging tests, and then a reasonable treatment plan should be given.