Herniated discs in the lower (lumbar) back can cause pain to radiate from the back through the buttock and into the thigh, ...

It causes nerve pain that starts in the spine at the lower back and goes into the buttocks, hips, and backs of the legs.

He refused to bear weight on the left leg or sit on the left buttock area. Direct palpation of the left buttock and sacroiliac joint produced pain. No local swelling was apparent. Hyperextension ...