What is it? Rare but classed as one of the most painful types and is more common in the lads than women. Presents as severe stabbing pain, generally on one side of the head, and pain has said to be so bad that it's often referred to as 'suicide headache'.
How long does it last? Anywhere from 15 minutes to three hours, but can occurs several times a day in "clusters" or waves and can continue for weeks to months.
What causes it? It's still being figured out by research is suggesting that they can be triggered by low magnesium levels in the blood. Best be getting your RDI of magnesium, right?
Treatments? Fast-acting treatments can include oxygen therapy, triptans, local anaesthetics and other emergency drugs.