Chronic headache and comorbidities: a two-phase, population-based, cross-sectional study.

Background: Studies using resources of a public family health program to estimate the prevalence of chronic daily headaches (CDH) are lacking.

Objectives: To estimate the 1-year prevalence of CDH, as well as the presence of associated psychiatric and temporomandibular disorders (TMD) comorbidities, on the entire population of a city representative of the rural area of Brazil.

Methods: This was a cross-sectional, population-based, 2-phase study.