There are circumstances when one tends to pass out yes; we are talking about fainting here. A sudden or a temporary loss of consciousness can be termed as fainting or syncope. This usually happens due to the lack of oxygen in the brain. Though the episode of fainting can be due would have no medical importance but sometimes it can indicate serious disease or condition like hypotension seizures or low blood pressure. Causes Emotional distress Drop in blood sugar Heat or dehydration Irregular heartbeats Triggers Seeing something which is unpleasant can cause one to faint One may pass out if