Low back pain and pain on both sides of the buttocks can be caused by the following reasons: first, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis can involve the fascia of the buttocks when it is serious and cause pain on both sides of the buttocks, then early examination and examination should be done to exclude other diseases for early diagnosis and treatment. Second, lumbar disc herniation, when the lumbar disc herniation can compress the nerves around the disc and cause lumbar pain, at the same time can appear on both sides of the buttocks pain symptoms, this time to check the lumbar spine CT and magnetic resonance to early diagnosis and early treatment. Third, rheumatoid spondylitis, which can appear back pain, accompanied by pain in the sacroiliac joints on both sides, it is necessary to take early lumbar spine X-rays, blood tests for early diagnosis and treatment. Fourth, ankylosing spondylitis, ankylosing spondylitis can also have low back pain and pain in the sacroiliac joints on both sides of the buttocks, often with morning stiffness, which requires early blood tests and X-rays of the sacroiliac joints and lumbar spine for early diagnosis and treatment.