What does it mean when I pass out after one beer?

It is very uncommon to pass out after one beer, unless the beer was heavily spiked or you have an extremely low tolerance for alcohol. Alcohol can cause the body to become relaxed and sleepy because it affects the central nervous system. One possible reason for passing out after one beer is that you already had a significantly lower than average tolerance for alcohol. Your body may need less alcohol to become intoxicated, which could explain why you passed out after only one drink. This is something that you should discuss with your doctor as there could be an underlying condition if this is not your first episode.

Another possibility is that you experienced a vasovagal reaction, which is a temporary drop in blood pressure that can cause fainting. Vasovagal reactions can be triggered by a variety of things, including drinking alcohol. If you have ever felt light-headed or dizzy after drinking alcohol, it's possible that you have a vasovagal reaction.

The most dangerous form of passing out after drinking alcohol is called alcohol poisoning, which requires immediate medical attention. Alcohol poisoning happens when the blood alcohol concentration becomes dangerously high. Symptoms of alcohol poisoning include nausea, disorientation, confusion, and difficulty walking. If you suspect someone is experiencing alcohol poisoning, or if you're passing out after only one alcoholic beverage, it's important to get medical help right away.