HeadacheHeadache DisordersTension-Type HeadacheCluster HeadacheVascular HeadachesMigraine DisordersHeadache Disorders, SecondaryDelayed DiagnosisPrenatal DiagnosisMigraine without AuraEarly DiagnosisSensitivity and SpecificityRetrospective StudiesSpinal PunctureTomography, X-Ray ComputedDiagnosisMigraine with AuraMagnetic Resonance ImagingNeurologyTreatment OutcomeDiagnostic ErrorsBlood Patch, EpiduralPrevalenceProspective StudiesAnalgesicsTrigeminal Autonomic CephalalgiasDura MaterTryptaminesSumatriptanTime FactorsFollow-Up StudiesRisk FactorsQuestionnairesIntracranial HypotensionChronic DiseaseBiopsyPredictive Value of TestsDiagnosis, Computer-AssistedReproducibility of ResultsNursing DiagnosisTrigeminal NerveSeverity of Illness IndexPhotophobiaFatal OutcomePrognosisComorbidityPain MeasurementNeurologic ExaminationPregnancyAge FactorsPreimplantation DiagnosisAcute DiseaseCohort StudiesInfant, NewbornFacial PainIncidenceRecurrenceCross-Sectional StudiesDiagnostic Techniques, NeurologicalPolymerase Chain ReactionSyndromeCase-Control StudiesNeck PainPseudotumor CerebriTemporomandibular Joint DisordersNeurosurgical ProceduresAge of OnsetPhysical ExaminationSex FactorsFacial NeuralgiaReferral and ConsultationBiopsy, NeedleMedical History TakingPainFetal DiseasesUnited StatesAmitriptylineBrazilAge DistributionPain ClinicsBrain DiseasesRelaxation TherapyDouble-Blind MethodMeningesSinus Thrombosis, IntracranialPrecipitating FactorsBiological MarkersBrain NeoplasmsVomitingCerebrospinal FluidSubarachnoid HemorrhageWhiplash InjuriesSex DistributionCerebral AngiographyEnzyme-Linked Immunosorbent Assay