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Headache is common in the community, with migraine and tension-type headache being the most common primary headache disorders to present to physicians (Headache 2004; 44:856). Frequent headache, called chronic daily headache, occurs on 15 or more days per month for 3 or more months (Curr Opin Neurol 2002; 15:287) and is the most challenging to treat. Chronic daily headache largely consists of chronic migraine (CM) and chronic tension-type headache (CTTH). Few controlled trials in these disorders have been conducted, largely because the definitions have been argued over for a long period and are only now standardized (Cephalalgia 2006; 26:742).
Botulinum toxin type A has been studied in both CM and CTTH and is the subject of a new meta-analys…