The American Headache Society® (www.AmericanHeadacheSociety.org)

"The American Headache Society® (AHS) is a professional society of health care providers dedicated to the study and treatment of headache and face pain. Founded in 1959, AHS brings together physicians and other health providers from various fields and specialties to share concepts and developments about headache and related conditions." 

The International Headache Society (www.i-h-s.org)

"The International Headache Society (IHS) is the world's membership organization for all whose professional commitment, whatever their discipline, is to helping people whose lives are affected by headache disorders."

The Migraine Trust (www.migrainetrust.org)

"The Migraine Trust is the UK's leading medical research and patient support charity for the condition. The Trust is committed to supporting sufferers and their families by funding and promoting research, improving diagnosis and treatment, providing information and advice, and raising awareness of migraine as a significant public health problem."

The National Headache Foundation (www.headaches.org)

 "The National Headache Foundation exists to enhance the healthcare of headache sufferers. It is a source of help to sufferers' families, physicians who treat migraine sufferers, allied health professional, and the public."