Sciatica is pain that radiates along the path of the sciatic nerve, which is the longest nerve in the body. The sciatic nerve originates in the lower back and sends signals to the legs. Sciatica occurs when the sciatic nerve becomes irritated or inflamed, often due to a pinched nerve or compressed discs in the lower back. Common symptoms include pain that radiates from the lower back through the buttock and down the back of the leg. Chiropractic care such as spinal adjustments can help reduce pressure on the sciatic nerve and relieve sciatica pain.