Gastrointestinal AgentsHeadacheHeadache DisordersTension-Type HeadacheStress, PsychologicalCluster HeadacheEndocrine GlandsEndocrine SystemQuestionnairesVascular HeadachesMigraine DisordersHeadache Disorders, SecondaryEndocrine Gland NeoplasmsEndocrine System DiseasesEndocrine DisruptorsMultiple Endocrine Neoplasia Type 1Multiple Endocrine NeoplasiaMigraine without AuraMultiple Endocrine Neoplasia Type 2aSpinal PunctureMigraine with AuraBlood Patch, EpiduralEnteroendocrine CellsPancreasNeurologyMultiple Endocrine Neoplasia Type 2bIslets of LangerhansTrigeminal Autonomic CephalalgiasAnalgesicsAntineoplastic Agents, HormonalTryptaminesSumatriptanHormonesDura MaterEndocrinologyIntracranial HypotensionTreatment OutcomePancreatic PolypeptideTamoxifenTrigeminal NervePituitary NeoplasmsAdenoma, Islet CellPhotophobiaEndocrine Surgical ProceduresSomatostatinMagnetic Resonance ImagingAdrenal Gland NeoplasmsPrevalenceGastrinomaAromatase InhibitorsChromograninsPituitary GlandTomography, X-Ray ComputedBreast NeoplasmsPheochromocytomaBenzhydryl CompoundsGlucagonomaChronic DiseasePancreatic NeoplasmsPain MeasurementGlucagonInsulinomaPancreatic HormonesPancreas, ExocrineEnvironmental PollutantsProto-Oncogene Proteins c-retCarcinoid TumorFacial PainEstradiolTime FactorsNeuroendocrine TumorsNeurosecretory SystemsInsulinNeurologic ExaminationCarcinoma, MedullaryReceptors, EstrogenPregnancyChromogranin ARetrospective StudiesHydrocortisone