2. High-Altitude Medicine - April 15, 1998 - American Academy of Family Physicians
The headache is probably caused by a mild increase in intracranial pressure and is typically throbbing, bitemporal or occipital, worse at night or in the early morning, and worse with the Valsalva maneuver or when bending forward.
http://www.aafp.org/afp/980415ap/harris.html

3. Pediatric Clinical Practice Guidelines for Nurses in Primary Care -- Health Canada - Sant Canada
This type of headache should be considered in any recurrent problem with headache. For recurrent or chronic headache, diagnostic information may include daily headache record (see. Explain underlying pathophysiology of vascular and muscle...
http://www.hc-sc.gc.ca/fnih-spni/pubs/nursing-infirm/2001_ped_guide/chap_15c_e....

4. eMedicine - Pediatrics, Headache : Article by Kirsten Bechtel, MD -- Emedicine Clinical Knowledge...
headache, migraine, migraine headache, tension headache, sinus headache, sinusitis, head trauma, intracranial mass, benign intracranial hypertension, pseudotumor cerebri, epilepsy, meningeal irritation Author:
http://www.emedicine.com/EMERG/topic382.htm