Loss of Consciousness (Unconsciousness)
When a person experiences a loss of consciousness, he or she is neither awake nor aware of the external environment. Loss of consciousness often is described as being "knocked out."
Attempts to arouse an unconscious person to an alert province may not be successful. The person may not respond at all or may respond with moans or non-purposeful movements.
A loss of consciousness for longer than 60 seconds needs to be evaluated by a doctor.
Any loss of consciousness after a head injury, even if only for a short time, requires immediate evaluation by a doctor.
Current as of: February 27, 2023
Author: Healthwise Staff
Medical Review:William H. Blahd Jr. MD, FACEP - Emergency Medicine & Anne C. Poinier MD - Internal Medicine & Adam Husney MD - Family Medicine & Kathleen Romito MD - Family Medicine & H. Michael O'Connor MD - Emergency Medicine