Piriformis syndrome is usually a neuromuscular condition in the event the piriformis muscle (a pear-formed muscle while in the buttocks) compresses the sciatic nerve (a nerve that extends with the lower spine all of the way right down to the foot). This brings about pain during the buttocks and hips. https://www.theorthopaedicandpainpractice.com/lower-back-and-buttock-pain/