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With an ad hoc, previously validated clinical record, we analysed the headache characteristics in 245 patients (F, 78.4%, M, 21,6%; mean age, 43.1±12.9 years) affected by chronic daily headache (CDH) attending 9 Italian headache centers. Migraine without aura was the episodic headache preceding CDH in 72.3% of the cases. We divided CDH into 3 categories: chronic tension-type headache (CTTH), chronic coexisting migraine and tension-type headache (CCMTTH), and chronic migraine (CM). CCMTTH accounted for 46.5% of the cases, followed by CM (30.2%) and CTTH (23.3%). Female prevalence was more marked in CCMTTH and CM groups, in which episodic headache started earlier. Migraine without aura was the episodic headache preceding CDH not only in most cases of CCMTTH (83.0%) and CM (91.9%), but also in 25% of CTTH patients. Analgesics misuse (abuse of weak analgesics and/or combination drugs in almost all the cases) prevailed among CCMTTH (61%) and CM (89%) patients with respect to CTTH patients (37%).[PUBLICATION ABSTRACT]