In my experience, most children improve after excluding chocolate, cheese, citrus and caffeine from their diet. Children are more flexible and compliant than adults with exclusion diets (though they usually groan about the chocolate ban), and will come back after two weeks improved or headache free. It is worth trying this for both migraine and tension-type headaches.
By all means use drugs to control intractable headaches, but diet should be the first line of treatment.
Dr Richard Lawson, Congresbury, North Somerset.