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Headache Is Common In The Population With Significant Impact On Quality Of Life And Economic Activity. Migraine Is The Most Common Diagnosis In All Clinical Settings, But Despite Its High Impact, The Needs Of Migraineurs Are Not Always Adequately Addressed. The Importance Of Psychosocial Factors In Pain Conditions And The Ever-present Concern That There May Be A Serious Underlying Pathology Offers A Number Of Challenges To The Clinician. This Chapter Offers An Overview Of Epidemiology And Impact And How Headache Is Classified-- Provided By Publisher.