title: Epidemiology of headache.
mesh_terms: D004644:Emotions; D005260:Female; D005502:Food; D006261:Headache / Q000453:epidemiology* / Q000209:etiology; D006306:Health Surveys; D006728:Hormones; D006801:Humans; D006973:Hypertension / Q000150:complications; D008297:Male; D008881:Migraine Disorders / Q000150:complications / Q000453:epidemiology / Q000209:etiology; D010551:Personality; D006113:United Kingdom; D014481:United States; D014887:Weather
chemical_list: D006728:Hormones