Vertigo (from the Latin vertigin-, vertigo, "dizziness," originally "a whirling or spinning movement," from vertō "I turn"[1]) is a specific type of dizziness, a major symptom of a balance disorder. It is a form of hallucination, a sensation of the environment spinning around one, usually in a clockwise fashion.
The effects of vertigo may be slight. It can cause nausea and vomiting and, in severe cases, it may give rise to difficulties with standing and walking.
Vertigo is qualified as height vertigo when referring to dizziness triggered by heights. "Vertigo" is often used, incorrectly, to describe the fear of heights, but the correct term for this is acrophobia.
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