This is what it means ...
Hyperintensity is a term used in MRI reports to describe how part of an image looks on MRI scan. Most MRIs are in black/white with shades of gray. A hyperintensity is an area that appears lighter in color than the surrounding tissues;
Hyperintensity on a T2 sequence MRI basically means that the brain tissue in that particular spot differs from the rest of the brain. A bright spot, or hyperintensity, on T2 scan is nonspecific by itself and must be interpreted within clinical context (symptoms, why you had the MRI done in the first place, etc).
If there is no specific clinical diagnosis ... then these may be suggestive of non- specific changes in the brain, rather than pointing to any specific disease.
The FLAIR sequence is used to suppress the hyperintense signal produced by water (or cerebrospinal fluid) in the brain. This is especially helpful when looking for lesions around the brain ventricles (which contain cerebrospinal fluid).
Migraine & many other conditions can produce these findings, but in your situation a serious cause appears unlikely,
I hope that helps.
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