Sciatica is a pain which radiates from the lower back or buttocks down the sciatic nerve into one or other leg, or sometimes both. Sciatica may also be accompanied by more generalised lower back pain.
Sciatica can be caused by a slipped disk or by muscular pressure on the sciatic nerve, typically from the piriformis muscles which is found deep in the buttocks. Sciatica can be aggravated by exertion, coughing, sneezing or straining. In severe cases there may be numbness, weakness and reduction of reflexes in the affected leg.
Myofascial Release for Sciatica
Please also see piriformis syndrome.