It's true and it happens when nerves around the stomach (called vagus nerve) react to the cold by sending a signal to the brain. Because among other effects sig

It's true and it happens when nerves around the stomach (called vagus nerve) react to the cold by sending a signal to the brain. Because among other effects signals from the vagus nerve reduce cardiac frequency, you can indeed pass out as a result. Not a doctor, but it happened to my wife and it was a little scary.