Decreased Level of Consciousness Overview

A decreased level of consciousness is a decline in mental acuity and alertness. Examples include lethargy, light-headedness, faintness (fainting), syncope, stupor, and other types. The cause is often a brain or neurological disorder, including many life-threatening disorders (e.g. head injury, stroke), but there are many causes. Seek emergency medical attention for any decrease in the level of consciousness.

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