['We studied the frequency of unrecognized headache associated with overuse of analgesic drugs in a population of headache patients treated at a neurological centre.', 'Patients in North Norway referred to a neurologist for headache during a 2-year period completed a questionnaire. From a total of 945, 262 patients (28%) reported headache 3 days or more per week and used analgesic drugs on a daily bases.', 'A specific diagnoses given by the neurologist was reported in 134 of the patients (51%). Only two patients reported that they suffered from a possible drug-associated headache.'] Is drug-associated headache unrecognized in patients treated at a neurological centre?