Piriformis syndrome is a condition in which the piriformis muscle, located in the buttock region, spasms and causes buttock pain. The piriformis muscle can also irritate the nearby sciatic nerve and cause pain, numbness and tingling along the back of the leg and into the foot (similar to sciatic pain).The Piriformis MuscleThe piriformis muscle is a small muscle located deep in the buttock (behind the gluteus maximus).The piriformis muscle:Starts at the lower spine and connects to the upper surface…