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A blackout can refer to several medical conditions relating to a loss of consciousness:
- Fainting (or syncope), the loss of consciousness due to low blood pressure;
- Sleepwalking, a sleep state where the mechanisms that in most cases prevent a person from moving during sleep are not functioning properly, allowing a person to move about during a dream state;
- Concussion, an injury to the brain which may or may not result in loss of consciousness, but usually results in disorientation and the later inability to recall memories of the incident;
- Amnesia, a condition where a person loses either short term memory or long term memory, either temporarily or permanently.