When you get pain in your butt

Typical symptoms in piriformis syndrome include pain in the affected buttock and tingling, numbness or pain running down the back of the affected thigh. — Filepic

Piriformis syndrome is a disorder in which the piriformis muscle inside your buttock has spasms and causes pain in your buttock, as well as other symptoms.

The piriformis muscle is very near your sciatic nerve, so it can also irritate it and cause pain, numbness and tingling down the back of your thigh and leg.