Also called tic douloureux, is a chronic pain condition that causes extreme, sporadic, sudden burning or shock-like face pain. The pain seldom lasts more than a few seconds or a minute or two per episode. TN pain is typically felt on one side of the jaw or cheek. In the days before an episode begins, some patients may experience a tingling or numbing sensation or a somewhat constant and aching pain. The presumed cause of TN is a blood vessel pressing on the trigeminal nerve in the head as it exits the brainstem.