Vertigo is a type of dizziness felt as a shift in a person's relationship to the normal environment (a feeling that the room is spinning is common) or a sense of movement in space.

Although dizziness and vertigo are often used interchangeably, they are not the same thing. While all vertigo is dizziness, not all dizziness is vertigo.

True vertigo, from the Latin "vertere," to turn, is a distinct, often severe form of dizziness that is a movement hallucination.

There are four major types of...