Butt and thigh pain can be caused by the following reasons: first, exertion and cold, resulting in buttocks and thighs of the fasciitis, then there can be buttocks and thighs at the same time the back of the pain of the symptom, this time to be early checkups and inspections, to exclude other diseases to diagnose and early treatment. Second, pyriformis syndrome, pyriformis syndrome patients can also have symptoms of pain in the buttocks and thighs at the same time, which can be accompanied by sciatic nerve pain in the lower limbs, then we need to check the body early, check the neuromuscular electromyography to diagnose and early treatment. Third, lumbar spine disease, when the lumbar disc herniation or lumbar spinal stenosis compresses the nerve root, it can lead to pain in the buttocks and the back of the thighs, this time, we should check the lumbar spine X-ray, CT, MRI and physical examination for early diagnosis and early treatment.