MedicineNet.com: Headaches - Articles written by medical doctors about the different types of headaches - migraine, tension, cluster, menstrual, and spinal headaches - and their causes, symptoms, diagnosis and treatment.
Discovery Health - Headache Center - Offers tips for becoming headache-free, treatments for migraines, tension and cluster headaches, a quiz, and a timeline of headache treatments through the ages.
Cluster Busters - Information regarding the use of hallucinogenic substances for the treatment of cluster headaches and another vascular headaches.
OUCH (UK) - Organisation dedicated to helping sufferers and those researching into cluster headaches. Profile, objectives, news, research and chat room.
Algies vasculaires de la face - Pages personnelles d'une personne atteinte de cette maladie. Description de la maladie, conseils pratiques et forum.
Organization for Understanding Cluster Headaches - Information about OUCH and its activities. Includes a quiz, medical news, comparison table and the International Headache Society diagnostic criteria.
FamilyDoctor.org - Cluster Headaches - Information about cluster headaches from the American Academy of Family Physicians.
Cluster Headaches - Symptoms, Treatment and Prevention - In-depth discussion with links to alternative appliances.
Cluster Busters - International organization dedicated to researching and promoting the treatment of cluster headaches with hallucinogenic substances.
eMedicine Health - Cluster Headache FAQs - Consumer health resource with FAQs relating to these headaches characterized by short-lived attacks of sudden, severe pain around one of the eyes.
ClusterHeadaches.com - Support site devoted to those who suffer from cluster headaches
Kirchner Headache Clinic - Dr. Kirchner has treated thousands of people suffering from a variety of headaches including migraine, cluster and post traumatic headache. Find information about migraines, diet and an enquiry form. | 
