AspirinHeadacheHeadache DisordersTension-Type HeadacheCluster HeadacheVascular HeadachesMigraine DisordersHeadache Disorders, SecondaryPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalGene FrequencyMigraine without AuraTiclopidineThromboxane B2Cyclooxygenase InhibitorsPlatelet AggregationTime FactorsSpinal PunctureMigraine with AuraTreatment OutcomeSalicylatesDrug Therapy, CombinationAnalgesicsPlatelet Function TestsRisk FactorsBlood Patch, EpiduralDouble-Blind MethodProspective StudiesNeurologyTrigeminal Autonomic CephalalgiasDose-Response Relationship, DrugBlood PlateletsTryptaminesSumatriptanPrevalenceQuestionnairesSodium SalicylateDura MaterFollow-Up StudiesFibrinolytic AgentsAnticoagulantsRetrospective StudiesHemorrhageWarfarinIntracranial HypotensionChronic DiseaseCase-Control StudiesMagnetic Resonance ImagingTrigeminal NerveIbuprofenAsthma, Aspirin-InducedRecurrenceGenotypeTablets, Enteric-CoatedPhotophobiaCyclooxygenase 1IndomethacinGastrointestinal HemorrhagePain MeasurementBleeding TimeAllelesCohort StudiesFlushingPlatelet ActivationProstaglandin-Endoperoxide SynthasesTomography, X-Ray ComputedDrug ResistanceThromboxanesPolymorphism, GeneticIncidenceDipyridamoleAcetaminophenDrug Administration ScheduleMutationNaproxenThrombosisThromboxane A2StrokeAge FactorsSeverity of Illness IndexSex FactorsCyclooxygenase 2 InhibitorsComorbidityCross-Sectional StudiesPlacebosFacial PainNeurologic ExaminationMyocardial InfarctionCerebrovascular DisordersRandomized Controlled Trials as TopicLipoxinsRisk AssessmentDrug InteractionsNeck PainGastric MucosaElectric StimulationAcute DiseaseDiagnostic Techniques, NeurologicalCross-Over StudiesAdministration, Oral