what is sciatica pain in the legs
Sciatica facts. 1  Sciatica is nerve pain from irritation of the sciatic nerve. 2  The sciatic nerve is the largest nerve in the body. 3  Sciatica pain is typically felt from the low back to behind the thigh and radiating down below the knee. 4  Treatments for sciatica depend on the underlying cause and the severity of the pain.