Effective Trigeminal Neuralgia Treatment Options Trigeminal neuralgia (TN) is a chronic pain condition that affects the trigeminal or 5th cranial nerve. The trigeminal nerve is responsible for sensation in the face. It branches out into three divisions - the ophthalmic, maxillary, and mandibular nerves. TN causes severe, sporadic facial pain that usually feels like a clicking or electric shock in specific areas like the cheek, lips, nose,...