Women’s left side of the buttocks with lumbar pain can be caused by the following reasons: First, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis is serious, you can have lumbar pain at the same time with buttock pain symptoms, often in the cold, exertion pain is more significant, then to early checkups and inspections, to exclude other diseases to diagnose and early treatment. Second, lumbar spine disease, when the lumbar disc herniation, lumbar spinal stenosis, there can be disc compression of the nerves and lead to lumbar pain, and at the same time can be radiated to the buttock pain, this time to early examination of lumbar spine of the CT, MRI for early diagnosis and treatment. Third, ankylosing spondylitis, ankylosing spondylitis patients can have low back pain, at the same time can have the symptom of pain and discomfort over the buttocks, can be accompanied by morning stiffness, then we should check the sacroiliac joints X-ray, lumbar spine X-ray, and blood tests for early diagnosis and early treatment.