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Yes, many times. I myself have lost consciousness a few times as well. It's scary and can be a result of many things. Things like indigestion, eyesight issues, hypoglycemia, diabetes, mental issues, and random triggers for some people like smells or sights. I was getting blood drawn once at the military hospital and they brought in a basic trainee to sit across from me to get his drawn. He was a black teenager. The lady got the needle ready and he looked at it and his skin went white. I said, " You better catch him, he's on his way to the floor!" The nurse looked up and had a arms full of this kid, limp as a noodle. Out cold. Poor kid. It's called Syncope. It's a temporary loss of consciousness usually related to insufficient blood flow to the brain. It's also called fainting or "passing out." It most often occurs when blood pressure is too low (hypotension) and the heart doesn't pump enough oxygen to the brain.