Low back and buttock pain can be caused by the following reasons: first, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis can involve the buttocks when serious, resulting in pain in the buttocks along with low back pain, often pain at the hip fascia, the pain is more obvious after cold and exertion, then early examination and examination to exclude other diseases to diagnose. Second, lumbar spine diseases, when the lumbar disc herniation or lumbar spinal stenosis compression nerve, can have back pain, accompanied by pain in the buttocks, this time to check the CT and MRI of the lumbar disc to early diagnosis and treatment. Third, ankylosing spondylitis and rheumatoid diseases, patients with these two diseases can have low back pain, accompanied by pain in the sacroiliac joint above the buttocks, the pain increases in the morning, there are symptoms of morning stiffness, it is necessary to check the sacroiliac joint X-ray, lumbar spine X-ray and blood tests for diagnosis and treatment.