The severe pounding
of a migraine headache can last
for hours...
or even days.
But pain isn't the only symptom.
Migraines can affect other parts
of your body, too.
Scientists now believe migraines
are caused by a wave
of stimulation
on the surface of the brain.
During a migraine attack,
the trigeminal nerve is also
stimulated, releasing chemicals
called neuropeptides and causing
inflammation in the meninges --
the membrane that covers
the brain.
One chemical -- called CGRP --
is thought to play a major role
in worsening migraines
and prolonging their effects.
CGRP causes blood vessels
to dilate and triggers
additional inflammation, which
results in pain and sensitivity.
The trigeminal nerve also
stimulates the thalamus which
reacts like the brain's
relay station,
sending messages to other parts
of the body.
The thalamus controls the body's
sensitivity to light, sound,
and movement.
Auras can occur as a warning
before the migraine strikes --
triggering flashes of light,
or wavy, zigzag, and blurred
vision.
Auras may also cause tinnitus
or ringing in your ears.
Some people even lose
their ability to see or hear
normally.
A migraine attack can also
affect your digestive system
causing nausea and vomiting.
When a migraine finally
subsides, the physical effects
can linger.
Muscle weakness, dizziness,
confusion -- along with light
and noise sensitivity -- can
last up to 24 hours.
