The headache as a cost of psychokinesis
Psychokinesis is the claimed ability to move or affect objects through mental effort alone. In accounts that attach blinding headaches to the feat, the pain makes the supposed power feel costly: moving something is not effortless magic, but an act that drains or overwhelms the person attempting it.
That detail also turns an invisible ability into something readers can recognize. A person may be able to move an object across a room, but the throbbing pain afterward gives the act a physical consequence—and a reason not to use the power casually.
A story detail, not an established effect
A migraine is a neurological condition, not simply a synonym for an intense headache. The headaches linked to psychokinesis belong to accounts of the alleged ability; there is no established medical mechanism connecting mental object-moving to migraine. The side effect works as part of the story’s logic: extraordinary control comes with a very ordinary vulnerability, a body that can hurt.
