The possible causes of thigh root pain and walking pain include trauma, muscle overstrain, herniated lumbar disc, and synovitis of the hip joint. 1. Trauma: Trauma may be caused by passive hip joint wide range of activities, triggering tendon strains, which may cause thigh root pain walking pain. 2. Muscle fatigue: it may be due to the patient doing a wide range of strenuous activities involving the lower limbs, resulting in muscle fatigue, which may lead to muscle strain or lactic acid deposition, and then thigh pain walking pain. 3. Lumbar disc herniation: Lumbar disc herniation is caused by degenerative changes in the intervertebral discs, and the aggravation of the condition may lead to compression of the sciatic nerve, resulting in thigh pain or hip pain. 4. Hip synovitis: For patients with hip synovitis, it may lead to thigh pain when walking, and may be accompanied by joint effusion, hip joint swelling and other symptoms. Thigh pain walking pain may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.