Cluster headaches are the worst, and also the rarest headaches experienced, only affecting about 1% of the population. They are more common in men
than women, in
fact, 90% of people that get them are men
. Women who get them describe them as being worse than childbirth. Symptoms vary from person to person, can be random, or, more often, on a "schedule", at the same time each month, year etc.