Piriformis syndrome is often a neuromuscular situation once the piriformis muscle (a pear-shaped muscle within the buttocks) compresses the sciatic nerve (a nerve that extends through the lower backbone every one of the way all the way down to the foot). This ends in pain in the buttocks and hips. https://www.theorthopaedicandpainpractice.com/lower-back-and-buttock-pain/