More specifically, the sciatic nerve is comprised of lumbar nerve #4 and 5 and sacral nerve 1 and 2. These four nerves connect in the posterior part of the back and pelvis and they run through the buttocks area and down the posterior compartment of the leg, down past the knee and down into the heel and underside of the foot.
Sciatica is extremely painful and often comes and goes in no particular pattern. Often, patients have pain so intensely that even prescription pain medication will not help alleviate the pain.