HBOT causes the constriction of blood vessels in the body (the body’s protective response to increased oxygen). HBOT delivered at the time of acute migraine can help by constricting the dilated blood vessels that result in a pulsing sensation seen in migraine. In fact, increased oxygen is actually the primary treatment for cluster headaches. Dr. Harch’s research shows that if a migraine headache is the result of an injury to the brain (traumatic brain injury, toxic brain injury, etc.), the resultant headaches are one of the most responsive symptoms to HBOT. Studies on HBOT in migraine or cluster headache have shown that there is some evidence for HBOT in acute migraine and supplemental oxygen in cluster headache.