The main causes of pain in the buttocks brought about by pain in the lower back are muscle strain in the lumbar and buttock regions, compression of the lumbosacral plexus nerves, and ankylosing spondylitis. It is recommended to go to the hospital for examination, after clarifying the cause of the disease, under the guidance of the doctor to treat the cause. 1. Lumbar and hip muscle strain: due to the strain of the lumbar and hip muscles, it tends to be a dull pain in a deeper area. It is recommended to combine work and rest in daily life and avoid excessive prolonged work and study in one position. 2. Lumbosacral plexus nerve compression: Lumbosacral plexus nerve compression due to lumbar disc herniation and lumbar spinal stenosis causes radiating pain in the lumbar and buttock regions. 3. Ankylosing spondylitis: Ankylosing spondylitis can cause pain in the sacroiliac joints of the lower back and buttocks. There are many other reasons for the pain in the buttocks brought about by the pain in the lower back, and it is recommended to consult a doctor in a timely manner to clarify the cause of the disease and targeted treatment.