Passing out describes partial or complete loss of consciousness with interruption of awareness of oneself and one's surroundings.
What to Do
- If you are aware that a fainting spell is coming, sit with your head between your knees for a moment or two to increase the flow of oxygen to the brain.
- If you are experiencing blackouts, call your doctor for evaluation.
Blackouts — especially when combined with other symptoms — can signal serious conditions, such as heart failure, high blood pressure, or heart rhythm problems. Fainting can also be a sign of less serious conditions, such as fatigue, anemia, hunger, or prolonged standing.