Unconsciousness is when a person is unable to respond to people and activities. Often, this is called a coma or being in a comatose state.
Other changes in awareness can occur without becoming unconscious. Medically, these are called "altered mental status" or "changed mental status." They include sudden confusion, disorientation, or stupor.
Unconsciousness or any other SUDDEN change in mental status must be treated as a medical emergency.
If someone is awake but less alert than usual,...
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Source: HealthCentral Encyclopedia
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