I have personally met two school nurses who diagnosed brain tumors in children with chronic headaches. Migraines related to homones frequently start in middle school with puberty and end when it is over. I could not find it in the literature reveiw, but I did hear of a school nurse research study that directly related headaches with lack of breakfast. That habit most often starts in middle school.
If you are a member of the National Association of School Nurses you can have full text access to theJournal of School Nurisng articles: www.nasn.org
Go to members only section and click on the journal link
Kolar, K.R., Fisher, W, & Gordon, V. (2001). "Nurse, my head hurts": a review of childhood headaches. Journal of School Nursing 17(3), 120 - 125.
Rhee, H. (2001). Risk factors for and sequelae of headaches in schoolchildren with clinical implications from a psychosocial perspective. Journal of Pediatric Nursing. 16(6), 392-401.
Schneider MB, Friedman SB, Fisher M. (1995). Stated and unstated reasons for visiting a high school nurse's office.
J Adolesc Health. 16(1), 35-40.
DiMario FJ (1992). Childhood headaches: a school nurse perspective. Clinical Pediatrics, 31(5), 279 - 282.