A nerve root is the part of a spinal nerve that exits the spinal cord and branches to innervate various parts of the body. Nerve root impingement, typically causing radiculopathy, is a condition that occurs when a nerve root in the spinal cord is pinched or irritated. This can cause pain, numbness, tingling or weakness in the area of the body that the nerve supplies. Other symptoms of nerve root impingement may include weakness or difficulty moving the affected limb, loss of reflexes and sensation, and sharp pain or electric-like sensations that radiate down the arm or leg. Nerve root impingement can be caused by a variety of conditions, including herniated discs, bone spurs, tumors, spinal stenosis (narrowing of the spinal canal), and spondylolisthesis (a condition in which a vertebra slips out of place).