Headache Consortium Guidelines - Evidence based guidelines on headache diagnosis and treatment. 

Headache Diary - An online diary to track your headaches.

The Migraine Relief Center - Information about migraine headaches from GlaxoSmithKline, maker of leading prescription medication Imitrex.

Headache & Migraine Treatment - Michigan Head Pain And Neurological Institute - Information on migraine treatment from the Michigan Head-Pain & Neurological Institute (MHNI).

Headache and Migraine - Information and resources for Migrane sufferers can be found here at NeurologyChannel.com. Symptoms and Treatments as well as up to the minute information from Neurologists.

JAMA Migraine Information Center - Medical news, literature search, library, patient education and support, highly selective list of links on migraines. A must visit.

Mayo Clinic: Headache - A description of the types of headaches and discussion of the types of treatment options available.

The Merck Manual - Pathophysiology, symptoms, signs, diagnosis and treatment options for migraines.

The MIDAS Web Site - Migraine Disability Assessment Questionnaire measures headache-related disability by counting the number of days of lost and limited activity due to migraine.

Migraine - Headache Resource Center - HealingWell.com - Comprehensive site with medical news, information and articles, links, message boards, books, and more on headaches and migraines.

Migraine Headache Information - Basic migraine headache information from the McKinley Health Center at the University of Illinois.

Migrainementors.com - Astrazeneca offers support and information for women who suffer from chronic migraine headache pain. Sponsored by AstraZeneca, maker of prescription migraine medication Zomig.

National Institute of Neurological Disorders and Stroke - Headache Info - Federal government's research programs on chronic headaches.