Headache is common in children, increasing in incidence from early childhood to adolescence. Primary headaches, due to no specific underlying cause, are the most common cause of chronic headaches in children. 50% of primary headaches in children are due to viral illnesses, migraines, or tension type headache. Secondary headaches, i.e. due to an underlying pathology, need to be considered in all children presenting with headache but are much less common.