Cluster headache (Hortonian) is one of the most severe types of pain. The person experiences prolonged attacks of very strong painful sensations of a pulsating character. Usually pain is one-sided, in the forehead or eye area, sometimes accompanied by redness, swelling, tears. Attacks, as a rule, last from 20 minutes to one and a half hours, but in severe cases can be repeated several times a day for several weeks. Most often this type of pain affects middle-aged men.