Hypothesis: chronic benign daily headache is an immune disorder with a viral trigger.
D000328:Adult; D001327:Autoimmune Diseases / Q000150:complications*; D002908:Chronic Disease; D005260:Female; D006261:Headache / Q000276:immunology*; D006566:Herpesviridae Infections / Q000150:complications / Q000276:immunology; D004854:Herpesvirus 4, Human; D006801:Humans; D008875:Middle Aged; D012008:Recurrence; D018139:Simplexvirus; D014777:Virus Diseases / Q000150:complications* / Q000276:immunology