noun
migraine
MY-grayn/ˈmaɪɡreɪn/
A severe recurring headache often accompanied by nausea or visual disturbances.
The woman rests in a dim room to ease her migraine.

Etymology
The components mean “half” and “skull”: the original term described pain on one side of the head. That image underlies the name of the severe headache.
In context
A migraine headache can be debilitating, causing throbbing pain on one side of the head, nausea, and extreme sensitivity to light and sound.