The Will Erwin Headache Research Center - Cluster Headache Study

Inclusion Criteria: * Diagnosis of a trigeminal autonomic cephalalgia according to the International Headache Classification including episodic cluster headache, chronic cluster headache, episodic paroxysmal hemicrania, chronic paroxysmal hemicrania, episodic short-lasting unilateral neuralgiform headache attacks with conjunctival injection and tearing (SUNCT), chronic SUNCT, episodic short-lasting unilateral neuralgiform headache attacks with cranial autonomic symptoms (SUNA), chronic SUNA, and hemicrania continua. OR Diagnosis of a trigeminal neuralgia according to the International Headache Classification, including classical trigeminal neuralgia and symptomatic trigeminal neuralgia. * Able to provide HIPAA authorization to share prior medical records/imaging. Exclusion Criteria: * Life expectancy less than 1 year, co-existing disease or other characteristic that precludes appropriate diagnosis of a trigeminal autonomic cephalalgia or trigeminal neuralgia. * Active drug or alcohol use or dependence that, in the opinion of the site investigator, would interfere with adherence to study requirements * Inability or unwillingness of subject or legal guardian/representative to give informed consent. Inclusion Criteria for Healthy Volunteers: * Inclusion criteria is willingness to consent and be of age 18 and older