light-headedness

noun
light-head·​ed·​ness | \ˈlīt-ˈhed-əd-nəs \

Medical Definition of light-headedness 

: the condition of being dizzy or on the verge of fainting dizziness or light-headedness, particularly when one arises to a standing position, is a predictable consequence of any medication tending to lower blood pressureHarvard Medical School Health Letter

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