When you think about someone having a headache, you probably think of an adult. However, an increasing number of children experience chronic headaches. The National Headache Foundation estimates that over sixty percent of all children suffer from occasional headaches. The majority of school-age children get headaches, and many have headaches on a recurrent basis. Even before entering school, roughly one-third of children experience a headache at some point. Children miss more than one million days of school each year because of headaches. Recurrent pediatric headache is a common disorder that may affect half of the population.