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Medically, there are actually several different kinds of "dizzy".
Suddenly worse when you stand up or move? Experience of things moving around you, spinning or swaying, or that YOU'RE spinning or swaying even though you know you're not? That's Vertigo. Usually caused by inflammation in the inner ear, but can also be caused by migranes.
Feel off balance? Difficulty moving? Running into stuff or falling over (or feel like you might)? Disequilibrium. Common in the elderly, it can also be related to the inner ear, but more often has to do with a general dulling of sensory input.
Lightheaded? Muscle weakness? Feeling faint? Presyncope. Cardiovascular or neurological.
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