AspirinHeadacheFatigueHeadache DisordersTension-Type HeadacheCluster HeadacheMuscle FatigueFatigue Syndrome, ChronicMental FatigueVascular HeadachesMigraine DisordersHeadache Disorders, SecondaryPlatelet Aggregation InhibitorsAnti-Inflammatory Agents, Non-SteroidalMigraine without AuraTreatment OutcomeTiclopidineThromboxane B2Cyclooxygenase InhibitorsQuestionnairesPlatelet AggregationSpinal PunctureMigraine with AuraDouble-Blind MethodSalicylatesTime FactorsDrug Therapy, CombinationAnalgesicsPlatelet Function TestsSeverity of Illness IndexBlood Patch, EpiduralProspective StudiesNeurologyQuality of LifePainRisk FactorsChronic DiseasePain MeasurementPrevalenceTrigeminal Autonomic CephalalgiasDose-Response Relationship, DrugMuscle ContractionTryptaminesSumatriptanBlood PlateletsFollow-Up StudiesMuscle, SkeletalSodium SalicylateDura MaterIsometric ContractionFibromyalgiaSleep DisordersDrug Administration ScheduleFibrinolytic AgentsIntracranial HypotensionAnticoagulantsDepressionWarfarinAsthenopiaHemorrhageAsthma, Aspirin-InducedIbuprofenPhysical EnduranceTrigeminal NerveTablets, Enteric-CoatedNeoplasmsRecurrenceComorbidityCyclooxygenase 1PhotophobiaMagnetic Resonance ImagingPlacebosElectromyographyCross-Sectional StudiesIndomethacinBleeding TimeGastrointestinal HemorrhageProstaglandin-Endoperoxide SynthasesPlatelet ActivationRetrospective StudiesNauseaThromboxanesTomography, X-Ray ComputedAcetaminophenFlushingDipyridamoleCohort StudiesThromboxane A2ExerciseNaproxenStrokeCross-Over StudiesAdministration, OralCase-Control StudiesThrombosisRandomized Controlled Trials as TopicCyclooxygenase 2 InhibitorsRelaxation TherapyNeurologic ExaminationSex Factors