Headache Disorders, Primary [Disease/Finding] Trigeminal Autonomic Cephalalgias [Disease/Finding] 986844 N0000171634 D051303 Trigeminal Autonomic Cephalalgias C1565172 M0480084 C7768704400419 Trigeminal Autonomic Cephalalgias Primary headache disorders that show symptoms caused by the activation of the AUTONOMIC NERVOUS SYSTEM of the TRIGEMINAL NERVE. These autonomic features include redness and tearing of the EYE, nasal congestion or discharge, facial SWEATING and other symptoms. Most subgroups show unilateral cranial PAIN.