The sciatic nerve is a large nerve comprised of smaller nerves that originate in the low lumbar and sacral regions of the spine. The sciatic nerve starts in the low back, travels through the buttock, and into the back of your leg. It has branches that travel all the way to the foot. Sciatic symptoms may include pain, numbness, tingling, cramping, burning and weakness in the muscles of the affected leg. There are many reasons why the sciatic nerve may be symptomatic including a herniated disc, narrowing of the nerve space in the spine, or tightness in hip muscles.