Trigeminal neuralgia or TN causes sudden facial pain that feels like a burn or shock. The classic, Type 1 form is sporadic and can last a few seconds to a couple of minutes. Multiple attacks may take place over a couple of hours. A patient with Type 2 TN may have constant pain; some patients have both forms. Also called tic douloureux, TN is a neuropathic pain, associated with nerve injury or lesion. It’s associated with the trigeminal nerve, one of a dozen nerve pairs linked to the brain. TN may be caused by a blood vessel pressing on this nerve and damaging the myelin sheath that protects it. Other, rare causes include a tumor, a malformation of arteries and veins, disease such as multiple sclerosis, or injury.