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Objective: To analyze the prevalence and demography of chronic daily headache (CDH) with analgesic overuse.

Methods: A population of 9,984 inhabitants aged 14 or older living in Santoña, Spain, was studied. The authors personally interviewed 4,855 subjects, using a quota sampling approach. Those with headache for ≥10 days/month and some analgesic use were asked to fill in a diary over the course of 1 month. Then, subjects were classified into CDH with or without analgesic overuse subtypes. Quality of life (Short Form-36 Health Survey [SF-36]) was also assessed in this second interview.

Results: Headache for ≥10 days/month with analgesic consumption was reported by 332 subjects. Seven had secondary headache. Seventy-four (standardized prevalence 1.41%, 95% CI 1.1 to 1.8) fulfilled criteria for CDH with analgesic overuse. Prevalence in women (2.6%, 2.0 to 3.3) was much higher than in …