What It Is and How to Relieve the Pain with Foam Rolling, Pressure Points, and Trigger Point Therapy Sciatica is a condition that causes pain, numbness, or tingling down the leg, along the path of the sciatic nerve. The sciatic nerve is the longest nerve in the body, and it runs from the lower back down through the buttocks, thigh, and calf, to the foot and toes. Sciatic Nerve Pain...