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Hallucinations are similar to waking dreams. You may see or hear things that are not actually there, or your mind may interpret actual situations in surreal or impossible ways.

Hallucinations are normally caused by imbalances in the chemistry of the brain, notably in the locations responsible for interpreting information from your senses. The simplest hallucinations involve seeing lights or colors, hearing sounds, or imagining that you are moving while actually stationary. It may be difficult or impossible to determine what is real and what is not.

The most serious hallucinations are similar to delusions, where you imagine a state completely different from reality. In this condition, it is possible to cause injuries to yourself by your actions, because your mind responds to what you perceive instead of what is there.

Hallucinations may be caused by psychotropic or psychedelic drugs (or excessive alcohol); by injury; or by any condition that changes the body's metabolism, such as allergic reactions, fever, or dehydration (e.g. the "mirages" seen by persons marooned in a desert environment without water).

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Q: What happens when you hallucinate?
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