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Headache Disorders
Chronic Daily Headache; Headache Syndromes; Headache, Intractable; Cephalgia Syndrome; Chronic Daily Headaches; Chronic Headaches; Daily Headache, Chronic; Daily Headaches, Chronic; Headache Disorder; Headache Syndrome; Headache, Chronic
Various conditions with the symptom of HEADACHE. Headache disorders are classified into major groups, such as PRIMARY HEADACHE DISORDERS (based on characteristics of their headache symptoms) and SECONDARY HEADACHE DISORDERS (based on their etiologies). (International Classification of Headache Disorders, 2nd ed. Cephalalgia 2004: suppl 1)