Many of us are familiar with the warm, carefree feeling that comes after a drink or two — alcohol has long been known to lower inhibitions and relax the body. But what about that unexpected red flush that appears on some people’s faces after even just a sip?
If you’ve ever turned beet-red after a glass of wine, you’re not alone — and now, medical experts have explained exactly why it happens, and what it could mean for your health.
The “Alcohol Flush” Reaction Affects Millions
An estimated 540 million people worldwide experience facial flushing after consuming alcohol. While it might seem like a harmless side effect, experts say it can actually indicate a deeper issue with how your body processes alcohol.
What Causes the Redness?
When you drink alcohol, your liver gets to work breaking it down. Normally, it converts ethanol into acetaldehyde (a toxic compound), and then quickly into acetate, which is safer for the body to eliminate.
However, people with alcohol flush syndrome have a genetic variant that makes this second step slower. As a result, acetaldehyde builds up in the body — and that’s where the problems start.
This toxic buildup triggers a histamine response, leading to symptoms like:
Flushed or red skin (especially the face)
Increased heart rate
Nausea
Headaches
One of the most visible signs is dilation of the facial blood vessels, which creates a red or blotchy appearance — particularly noticeable on lighter skin tones.
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