Sore buttocks may be caused by strenuous exercise, lumbar disc herniation, pyriformis syndrome and other reasons. 1. Strenuous exercise: If the patient has been sitting for a long time, squatting for a long time, or doing strenuous exercise on the hips, it may cause straining of the hip muscles or accumulation of lactic acid, which may lead to the symptom of buttock soreness. 2. Lumbar disc herniation: Lumbar disc herniation is the degeneration and abnormal bearing of lumbar disc, which leads to the rupture of lumbar annulus fibrosus and herniation of nucleus pulposus; when lumbar disc herniation occurs, the nerve root will be squeezed, and then buttock soreness may occur. 3. Piriformis syndrome: Piriformis syndrome refers to a syndrome in which the sciatic nerve is squeezed in the region of the piriformis muscle, and the squeezing of the sciatic nerve causes sciatica, which may lead to the phenomenon of buttock pain. When the patient has a sore buttock, it is recommended to go to the hospital in time, after a detailed examination, under the guidance of the doctor for standardized treatment.