Like migraines, they are caused by swelling blood vessels in the head. Some researchers suspect that people get cluster headaches when they are not getting enough oxygen for some reason. Fluctuating neurotransmitter levels may play a role. Other suspected triggers include alcohol, cold or hot wind, high altitude, stress, and smoking. Cluster headaches occur most often in spring or fall.
Most sufferers are male.
Once you have pain, inhaling oxygen is the only treatment known to bring relief. Herbal remedies also show promise. Feverfew may ease the pain of cluster headaches, but can have side effects like mouth ulcers. This Web site is a free resource. Links to certain services are available only to AdvancePCS members.