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, ask a few simple questions, such as:
- What is your name?
- What is the date?
- How old are you?
Wrong answers or an inability to answer the question suggest a change in mental status.
Loss of consciousness - first aid; Coma - first aid; Mental status change; Altered mental status
Being asleep is not the same thing as being unconscious. A sleeping person will respond to loud noises or gentle shaking -- an unconscious person will not.
An unconscious person cannot cough or clear his or her throat. This can lead to death if the airway becomes blocked.
Unconsciousness can be caused by nearly any major illness or injury, as well as
Brief unconsciousness (or
Other causes of fainting include straining during a bowel movement, coughing very hard, or breathing very fast (hyperventilating).
Review Date: 07/08/2009
Reviewed By: Jacob L. Heller, MD, MHA, Emergency Medicine, Virginia Mason Medical Center, Seattle, Washington, Clinic. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc.