Buzz
Genetic factors are responsible for the facial redness some individuals experience after drinking alcohol. This reaction is particularly prevalent among those of Asian and Jewish ancestry.
Ryan McVay/Digital Vision/ThinkstockThe long-awaited Friday evening arrives at 5 p.m. You rush from work to join your friends at the neighborhood bar, eagerly anticipating happy hour. Soon, you’re at the bar, sipping your first discounted drink. However, instead of the expected warmth, you’re hit with an overwhelming wave of dizziness, nausea, and a rapid heartbeat, accompanied by a bright red flush spreading across your neck and face. This wasn’t part of the plan—so what’s going on?
The silver lining? You weren’t drugged. The downside? You’re dealing with alcohol flush reaction or alcohol intolerance, a condition where your body has difficulty metabolizing alcohol.
Typically, an enzyme called aldehyde dehydrogenase 2 (ALDH2) helps break down acetaldehyde, a toxic byproduct formed during alcohol metabolism. If ALDH2 is inactive, acetaldehyde builds up, causing various adverse effects. Common symptoms include facial and neck redness, along with headaches, dizziness, nausea, rapid heartbeat, and swelling.
For some individuals, even a single alcoholic beverage can trigger facial flushing. Others may require multiple drinks before redness appears. Sensitivity varies, but certain groups, particularly those of Jewish or Asian descent (such as Japanese, Chinese, or Korean), are more likely to experience this due to genetic factors. The inactive or mutated ALDH2 enzyme can be inherited from one or both parents. Additional risk factors include food allergies (e.g., grains), certain medications (antibiotics or antifungals), or conditions like Hodgkin's lymphoma [source: Columbia Health, Mayo Clinic].
A 2010 study in BMC Evolutionary Biology traced the mutated gene to southern China around 10,000 years ago. Researchers believe it evolved to prevent overconsumption of rice-based alcohol among Yangtze River farmers. Today, this gene is linked to lower alcoholism rates in Asian populations. It also inspired the drug disulfiram (Antabuse), which replicates the unpleasant effects of alcohol flush reaction to treat alcoholism [source: Hamilton].
Facial flushing from alcohol can also signal increased cancer risk. Individuals with the ALDH2 gene mutation face a significantly higher likelihood of developing esophageal cancer when consuming alcohol. For instance, someone with ALDH2 deficiency who drinks two beers daily is up to 10 times more likely to develop esophageal cancer compared to someone without the mutation drinking the same amount [sources: Brooks, et al., Mapes].
