Theo Nash
Alcohol flush reaction is a common condition that causes flushing or blotches on the face, neck, shoulders, ears, and sometimes the entire body after consuming alcohol. The reaction is the result of an accumulation of acetaldehyde, a metabolic byproduct of alcohol, due to an aldehyde dehydrogenase 2 (ALDH2) deficiency. While flushing itself is not harmful, it may indicate an alcohol intolerance or a higher risk of certain health conditions, such as high blood pressure and specific types of cancer. Therefore, flushed skin can be one of several signs of alcohol poisoning, along with other symptoms like nausea, headache, and general discomfort.
| Characteristics | Values |
|---|---|
| Primary symptom | Red face or flush |
| Other symptoms | Hives, nausea, low blood pressure, worsening of asthma, migraine, rapid heartbeat, vomiting, hypotension, throbbing headache, fatigue, stuffy nose, shortness of breath, diarrhoea, anaphylaxis |
| Risk factors | People of East Asian descent, people with an ALDH2 deficiency, people with rosacea |
| Treatments | Brimonidine, oxymetazoline, laser treatments |
| Prevention | Limit or avoid alcohol |
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Alcohol flush reaction
The ALDH2 enzyme is responsible for breaking down acetaldehyde. However, individuals with an ALDH2 deficiency have a faulty version of the ALDH2 gene, resulting in reduced enzyme function. This leads to higher levels of acetaldehyde in the body, triggering physiological effects such as facial flushing, nausea, headaches, and an increased heart rate.
The alcohol flush reaction is not an allergy but rather a type of alcohol intolerance. It is important to distinguish it from rosacea, a chronic facial skin condition that can also cause redness and flushing. While flushing itself is not harmful, it may indicate an increased risk of certain health issues, such as high blood pressure and cancer, especially when combined with tobacco use.
The level of acetaldehyde in the bloodstream can be measured through breathalyzer or blood tests. Genetic testing can also predict the likelihood and severity of the alcohol flush reaction by assessing variations in the alcohol dehydrogenase (ADH) and aldehyde dehydrogenase (ALDH) genes.
For individuals with an ALDH2 deficiency, the best way to prevent alcohol flush reaction is to avoid or limit alcohol consumption. While treatments like brimonidine and oxymetazoline can reduce facial redness, they do not address the underlying ALDH2 deficiency and may mask important symptoms.
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Alcohol intolerance
The most common symptoms of alcohol intolerance include skin flushing, a stuffy or runny nose, rapid heart rate, headache, low blood pressure, hives, and stomach pain. These symptoms can occur immediately or shortly after drinking alcohol. While flushing itself is not harmful, it may be a warning sign of other risks such as an increased chance of developing high blood pressure, and a higher risk of certain types of cancer, including esophageal cancer.
People with alcohol intolerance have a genetic mutation that makes it difficult for their bodies to break down alcohol efficiently. When alcohol is consumed, it is broken down into a chemical called acetaldehyde. Normally, acetaldehyde is further broken down into a harmless substance called acetate by an enzyme called aldehyde dehydrogenase (ALDH2). However, in people with alcohol intolerance, this process is impaired because the ALDH2 is less active, causing acetaldehyde to build up in the blood and tissues, leading to the uncomfortable symptoms mentioned above.
There is no cure or treatment for alcohol intolerance. The best way to prevent alcohol intolerance symptoms and reduce the associated risks is to avoid alcohol or limit alcohol intake. Lifestyle changes such as choosing drinks that are low in sulfites and other preservatives, staying hydrated, and eating before consuming alcohol can also help to manage symptoms.
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Cancer risk
Flushing of the skin after drinking alcohol is a symptom of high alcohol sensitivity, indicating that the body is accumulating toxic levels of acetaldehyde, a metabolic byproduct of alcohol catabolism. While flushing itself is not a serious health issue, it may signal an increased risk of certain cancers, particularly in individuals with alcohol intolerance or specific gene variations.
The alcohol flush reaction is linked to a higher risk of cancer, especially in individuals who continue to consume alcohol despite experiencing this reaction. The accumulation of acetaldehyde, a carcinogenic molecule, is the primary cause of this increased risk. Acetaldehyde is normally metabolized into non-toxic molecules by the enzyme aldehyde dehydrogenase (ALDH). However, in individuals with an ALDH2 deficiency or certain gene variations, the breakdown of acetaldehyde is impaired, leading to its buildup and subsequent toxic effects.
East Asians are particularly susceptible to alcohol flush reaction due to a higher prevalence of the rs671 (ALDH2*2) allele, which results in a less functional acetaldehyde dehydrogenase enzyme. This genetic variation not only contributes to the alcohol flush reaction but also increases the risk of esophageal cancer. A study in Korean men found a significant association between the development of facial flushing after drinking and an increased risk of hypertension and cancer, particularly esophageal cancer.
In addition to esophageal cancer, alcohol flush reaction has been associated with an increased risk of other cancer types, including breast cancer and endometrial cancer. Furthermore, alcohol consumption itself is a known risk factor for various cancers, including cancer of the mouth, throat, voice box, and skin. Therefore, individuals who experience flushing after drinking alcohol may be at a higher risk for these cancers, especially if they continue to consume alcohol.
It is important to note that while flushing may be a visible indicator of high alcohol sensitivity, even individuals who do not exhibit flushing are still at risk of the health complications associated with alcohol consumption. The Centers for Disease Control and Prevention (CDC) recommends drinking in moderation to reduce these health risks. Additionally, individuals with alcohol intolerance or allergy should avoid alcohol to prevent unpleasant symptoms and lower their risk of cancer and other serious diseases.
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Treatments for flushing
Flushing of the skin is indeed a symptom of alcohol poisoning. This is caused by an accumulation of acetaldehyde, a metabolic byproduct of alcohol catabolism, due to an aldehyde dehydrogenase 2 (ALDH2) deficiency. This is more common among people of East Asian descent, with around 30-50% of Chinese, Japanese, and Korean people experiencing this.
While there are treatments that can control flushing, it is important to note that these treatments do not address the ALDH2 deficiency and only hide the symptom of flushing. Thus, if you experience facial flushing when drinking alcohol, it is recommended to limit or avoid alcohol consumption and consult a doctor.
- Histamine-2 (H2) blockers: These drugs can control facial flushing by slowing the breakdown of alcohol into acetaldehyde in the bloodstream. However, they can increase the risk of stomach, oesophageal, and skin cancers, as well as enable higher alcohol consumption, which can elevate the risk of cancer.
- Brimonidine: This topical therapy is used to temporarily reduce facial redness by decreasing the size of small blood vessels.
- Oxymetazoline: This topical cream was approved in 2017 to treat rosacea, which can help with facial redness by constricting blood vessels in the skin.
- Laser and light-based therapies: These treatments can reduce redness and improve the appearance of visible blood vessels.
- Disulfiram: This drug, sometimes used to treat alcoholism, induces effects similar to alcohol flush, causing a rapid increase in acetaldehyde concentration in the body.
- Ethanol patch test: An ethanol-soaked bandage is placed on the skin for 20 minutes.
It is important to note that while these treatments may reduce flushing, they do not address the underlying cause of the flushing, which is the accumulation of acetaldehyde due to an ALDH2 deficiency. Therefore, it is crucial to consult a doctor and consider reducing alcohol consumption to manage this condition effectively.
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Rosacea
While flushed skin is a symptom of alcohol flush reaction, it is also a symptom of rosacea, a chronic but treatable skin condition. Rosacea primarily affects the central face and is characterised by flare-ups and remissions. It is estimated that rosacea affects over 16 million Americans.
The cause of rosacea is unknown, and there is no cure, but medical therapy can effectively control the symptoms. Rosacea is more frequently diagnosed in women, but tends to be more severe in men. It is also believed that individuals with fair skin who tend to flush or blush easily are at a higher risk of developing rosacea.
Facial flushing due to alcohol consumption is usually caused by an ALDH2 deficiency, which is more common among people of Asian and Jewish descent. This deficiency causes more acetaldehyde to build up in the body, leading to alcohol intolerance and facial flushing. While the flushing itself is not harmful, it may indicate a higher risk of certain health issues, such as high blood pressure and cancer.
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Frequently asked questions
Flushed skin is not a sign of alcohol poisoning, but rather a symptom of alcohol flush reaction, which is caused by an accumulation of acetaldehyde in the body. This reaction is more common among people of East Asian descent, affecting around 30-50% of Chinese, Japanese, and Korean individuals.
In addition to facial flushing, individuals with alcohol flush reaction may experience nausea, headaches, a fast heart rate, hives, low blood pressure, and an increased risk of certain types of cancer, particularly esophageal cancer.
For individuals with alcohol flush reaction, the only way to prevent the reaction is to limit or avoid alcohol consumption entirely. While there are treatments, such as topical medications and laser therapies, that can help reduce facial redness, they do not address the underlying cause of the reaction, which is an accumulation of acetaldehyde due to an enzyme deficiency.
