The Cleveland Clinic in Ohio says the cluster headache can be many times more intense than a migraine.

VOA: special.2010.03.30

"Our study showed for the first time a clear difference between oxygen and air in the treatment of acute cluster headache.

VOA: standard.2009.12.17

It was properly powered,randomized and placebo-controlled and really provides evidence for the use of oxygen in cluster headaches,"

VOA: standard.2009.12.17

Dr.Peter Goadsby of the University of California and other researchers followed The doctors treated for cluster headaches in each patient using air and oxygen in separate trials.

VOA: standard.2009.12.17