The sciatic nerve starts in the lower back and runs down each leg. When it is bruised, stretched, or cut, the leg sends clear distress signals. The hallmark is a sharp, shooting pain that begins in the buttock and travels down the back of the thigh. Coughing, sneezing, or sitting on a hard chair can trigger an electric jolt. Numbness or tingling follows the same path. The calf or sole may feel “asleep,” making it hard to sense the brake pedal while driving. Muscle weakness shows up next. The foot may slap when you walk, or you might struggle to... Learn more