Women’s left upper buttock pain can be caused by the following reasons: First, rheumatoid, when rheumatoid involvement of the spine can appear spinal pain, accompanied by sacroiliac joint pain, this time to early checkups and spinal X-ray, CT and blood tests for early diagnosis and treatment. Second, ankylosing spondylitis, ankylosing spondylitis patients can appear above the buttocks at the sacroiliac joints of the soreness, can be accompanied by the lumbar back pain and discomfort, there is morning stiffness and morning sickness and pain aggravation, then we need to take X-ray film of the sacroiliac joints and lumbar spine at an early stage, blood tests, for early diagnosis and early treatment. Thirdly, myofasciitis on the buttocks, myofasciitis on the buttocks can also appear above the buttocks soreness symptoms, common in cold or tired patients, this time to early checkup and examination, exclude other diseases to diagnose.