☉ Doctors online now - 15 minute priority booking available
- The cause is not entirely clear.
- However, a common theory is that blood vessels in parts of the brain become narrower (go into spasm) which causes the aura.
- The blood vessels are then thought to open wide (dilate) soon afterwards, which accounts for the headache.
- There may also be a genetic factor involved as it often occurs in several members of the same family.
