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The Headache Impact Questionnaire (HImQ) is a 16-item; self-administered questionnaire used to measure pain and activity limitations from headache, though not specifically migraine, over a 3-month recall period. It includes headache duration, last headache, pain intensity (two questions), need for bed rest (two questions), disability in specific domains of activity (seven questions about interference with ability to work, do household chores, and engage in non-work activity), and symptoms (two questions). This instrument was developed to capture information about pain and headache-related disability to help doctors and patients evaluate the impact of headache on the individual's daily life. Headache-related disability is expressed as hours or days of lost productivity and functioning. This instrument is most appropriate for a study in which the impact of the intervention is tested over a prolonged period of time.