Our Health Library information does not replace the advice of a doctor. Please be advised that this information is made available to assist our patients to learn more about their health. Our providers may not see and/or treat all topics found herein.

Level of consciousness

Level of consciousness is a term used to describe a person's awareness and understanding of what is happening in his or her surroundings.

There are three main levels of consciousness:

Consciousness is an awake state, when a person is fully aware of his or her surroundings and understands, talks, moves, and responds normally.
Decreased consciousness is when a person appears to be awake and aware of surroundings (conscious) but is not responding normally. While in a state of decreased consciousness, a person may not answer when spoken to, stare straight ahead, and have no facial expression. Others may think the person is acting confused, odd, or sleepy. Later, the person may not be able to recall what happened.
Unconsciousness is when a person is not aware of what is going on and is not able to respond normally to things that happen to and around him or her.
- Fainting is a brief form of unconsciousness.
- Coma is a deep, prolonged state of unconsciousness.
- General anesthesia is a controlled period of unconsciousness.

Current as of: October 24, 2023

Author: Ignite Healthwise, LLC Staff

Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.