There are several reasons for pain in the buttocks below the waist: first, gluteal epithelial neuritis, characterized by diffuse pain in the outer upper quadrant of the buttocks, with a compression pain according to the course of the gluteal epithelial nerve. Secondly, lumbar disc herniation or lumbar spinal stenosis, characterized by lower extremity disseminated pain, pressure pain in the lumbar spine next to the myelopapillary process or intermuscular space, and to the buttocks and lower extremities, go to the hospital to check the lumbar spine CT or lumbar spine MRI, it can be diagnosed as whether it is suffering from lumbar disc herniation or lumbar spinal stenosis, if the CT and MRI results do not have this kind of disease, basically, it can be diagnosed with suprapubic epithelial neuritis. Neuritis.