There are several reasons for left buttock pain: 1. muscle strain caused by a posture that is too long. 2. it may be caused by pear-shaped muscle syndrome compressing the nerve, if the buttock pain caused by pear-shaped muscle syndrome, the pain will also radiate to the leg. 3. it may be caused by lumbar disc herniation or lumbar spinal stenosis compressing the nerve, which usually also causes pain, numbness and weakness in the leg. 4. it may be caused by epiglottic neuritis, followed by cold Or a posture is too long, caused by the hip epicutaneous nerve compression. 5, it may be caused by sacroiliac arthritis pain in the buttocks. So when there is pain in the buttocks, to reduce the activities of the local do do hot compresses, external use of futalin ointment, eat some soothing tendons and blood tablets, if there is no improvement, to the hospital for further examination.