Sciatica is the name given to any sort of pain that is caused by irritation or compression of the sciatic nerve. The sciatic nerve is the longest nerve in your body. It runs from the back of your pelvis, through your buttocks, and all the way down both legs, ending at your feet.
When something compresses or irritates the sciatic nerve, it can cause a pain that radiates out from your lower back and travels down your leg to your calf. Sciatic pain can range from being mild to very painful.
Causes of Sciatica
A slipped disc is the most common identified cause of sciatica, but in some cases there is no obvious cause.
Less common causes include spinal stenosis (narrowing of the nerve passages in the spine), injury, infection or a growth in the spine.