The condition is among the most disabling the world over — leaving sufferers of severe headaches unable to go about their lives for days or weeks at a time.
A headache produces pain felt around the head, but how severe the pain is depends on what type of headache you have.
There's more than 100, but some are far more common than others — especially tension-type headaches and migraines.
Tension-type headaches
Tension-type headaches are the most common form of headache — up to 30 per cent of the population will experience one each year.