Why Does My Stomach Hurt After Drinking Wine?

Wine triggers stomach pain through a combination of mechanisms that go beyond simple alcohol content. Fermented beverages like wine are unusually potent stimulators of stomach acid, and wine contains organic acids, histamines, and other compounds that compound the irritation. The pain you feel can range from a mild burning sensation to full-blown cramping or reflux, depending on the type of wine, how much you drink, and what else is going on in your digestive system.

Wine Drives More Acid Production Than You Would Expect

One of the main reasons wine is rougher on the stomach than, say, a vodka soda is that wine is a remarkably strong trigger for gastric acid secretion. Research dating back decades has shown that wine and low-concentration ethanol solutions push acid output to levels approaching what your stomach produces at maximum capacity. In one study, white wine stimulated acid secretion to about 82% of the peak response your stomach can muster, while a five-percent ethanol solution reached about 58%.¹ Over a three-hour period, white wine triggered roughly five times more acid than plain water.

The reason is not just the alcohol. Research has found that fermented beverages stimulate acid far more effectively than distilled spirits, even when alcohol concentrations are matched. Fermented drinks like wine, beer, and sherry pushed acid output to between 57% and 95% of the stomach’s maximum capacity, while the distilled versions of those same beverages lost much of that effect.² Something created during fermentation and removed by distillation is responsible for this extra acid stimulation. That means switching from wine to a distilled spirit at the same alcohol concentration could genuinely reduce the acid hit your stomach takes.

Researchers have identified specific organic acids in wine that drive this effect. Malic acid appears to be a key contributor in white wine, while succinic acid plays that role in red wine. Both of these acids stimulate proton secretion in stomach cells, which is the cellular process behind acid production.³ Wine also raises levels of gastrin, the hormone that tells your stomach to ramp up acid production, which prolongs the effect beyond just the time the wine is in contact with your stomach lining.

Alcohol Directly Injures the Stomach Lining

On top of the acid surge, alcohol itself physically damages the stomach’s protective barrier. Animal research has demonstrated that ethanol causes vascular injury in the stomach wall within minutes. When concentrated ethanol was applied to the stomach lining, increased vascular permeability appeared within one to three minutes, and visible damage to blood vessels followed within a minute at higher concentrations.⁴ The vascular damage consistently came before the development of hemorrhagic erosions, suggesting that injury to tiny blood vessels in the stomach wall is one of the earliest steps in alcohol-related gastric damage.

Wine’s alcohol concentrations are far lower than the concentrated ethanol used in those experiments, but the principle holds on a spectrum. Alcohol at any concentration disrupts the mucus layer that normally shields the stomach lining from its own acid. It also reduces lower esophageal sphincter pressure and esophageal motility, which makes it easier for acid to splash upward into the esophagus.⁵ The combination of more acid being produced and a weakened protective barrier is what makes the burning sensation after wine feel disproportionate to the amount you drank.

Why Wine Causes Reflux

If your pain feels more like a burning behind the breastbone than a deep stomach ache, reflux is the likely culprit. Wine has a specific and well-documented effect on the muscular valve between your esophagus and stomach. Drinking wine significantly lowers the pressure of the lower esophageal sphincter, which is the ring of muscle that normally keeps stomach contents from flowing backward. In one study, wine lowered this pressure enough to change the pattern of reflux from occasional relaxation-based events to a pattern that included “free reflux,” meaning acid could flow upward even without the sphincter actively relaxing.⁶ Pure ethanol at the same concentration did not produce this effect, which again points to something specific to wine’s composition beyond its alcohol content.

Wine also changes motility in the upper digestive tract. Low-concentration alcohol beverages like wine and beer tend to speed up gastric emptying, meaning the stomach pushes its contents into the small intestine faster than usual.⁷ That sounds like it would help, but faster emptying can sometimes mean more forceful contractions and a shorter window for neutralization. Meanwhile, higher-concentration alcoholic drinks tend to slow gastric emptying.⁸ The motility effects of wine land in an awkward middle ground where acid production is high and the normal pacing of digestion is disrupted.

Red Wine Versus White Wine

People often have strong opinions about which color of wine is “worse” for their stomach, and interestingly, the answer depends on which symptom you are talking about. When it comes to acid secretion, red wine appears to be the stronger trigger. A study using an intragastric probe in healthy volunteers found that red wine stimulated gastric acid production more potently than white wine, with red wine also showing a more pronounced effect on gene expression related to acid secretion in gastric cells.³ The difference traces partly to succinic acid, which is more abundant in red wine and is a more active stimulator of proton secretion than the malic acid that dominates white wine.

But when it comes to reflux, white wine may actually be worse. A comparison of the two found that white wine dropped lower esophageal sphincter pressure more sharply than red wine, and the fraction of time that esophageal pH dipped into acidic territory was considerably greater after white wine.⁹ So if your main complaint after wine is heartburn or a burning throat, white wine may be a bigger offender despite red wine’s reputation as the harsher option. If your pain is more of a deep, gnawing stomach ache, the higher acid stimulation from red wine might be more relevant.

Histamine, Sulfites, and Wine Intolerance

Not all wine-related stomach pain is about acid and reflux. Wine contains biogenic amines, including histamine, tyramine, and phenylethylamine, which are produced during fermentation. Red wine typically has higher concentrations of these amines than white wine. For people who are sensitive to histamine or who have reduced activity of the enzyme that breaks it down, even moderate wine intake can trigger flushing, headache, nasal congestion, and gastrointestinal symptoms including cramping, nausea, and diarrhea.

A large survey from a German wine-producing region found that self-reported wine intolerance was common, and the symptom patterns pointed more toward intolerance to alcohol, biogenic amines, or other wine ingredients than to a classic immune-mediated allergy.¹⁰ True wine allergy, driven by an immune response to grape proteins, does exist but is rare. The distinction matters because allergy involves the immune system’s antibody pathways, while intolerance reactions involve a failure to metabolize specific compounds.¹¹ Sulfites, which are added to most wines as preservatives, are another common suspect, though sulfite sensitivity more often causes respiratory symptoms than stomach pain.

There is also the “flush syndrome” familiar to many people of East Asian descent, caused by a genetic variation in the enzyme acetaldehyde dehydrogenase. People with this variation accumulate acetaldehyde, a toxic byproduct of alcohol metabolism, which produces facial flushing, nausea, and abdominal discomfort after even small amounts of alcohol.¹¹ If you consistently feel sick after any alcohol, not just wine, this genetic variation is worth considering.

How Wine Disrupts the Intestinal Barrier

The damage wine does is not confined to the stomach itself. Alcohol increases intestinal permeability, sometimes described as making the gut “leakier.” Research has shown that both ethanol and red wine increase the permeability of the duodenum, the first section of the small intestine, in a concentration-dependent manner.¹² When the spaces between intestinal cells widen, substances that normally stay in the gut can cross into underlying tissue, potentially triggering inflammation and pain that is felt lower in the abdomen.

Alcohol also shifts the gut microbiome and promotes immune activation, which can contribute to ongoing discomfort and digestive dysfunction even beyond the acute episode of drinking.¹³ Interestingly, some research has pointed to polyphenols in red wine as having anti-inflammatory properties that might partially counteract this effect in certain contexts. But the same polyphenols may also interact with other compounds in ways that amplify damage. One cell-culture study found that red wine components appeared to worsen the toxic effects of ochratoxin A, a common wine contaminant, on intestinal cell junctions.¹⁴ The net effect of red wine’s polyphenols on gut health is far from settled.

Why Pain Medications Make Wine Worse on Your Stomach

If you regularly take over-the-counter painkillers like ibuprofen, naproxen, or aspirin, wine can turn a mild irritant into a serious problem. Both alcohol and nonsteroidal anti-inflammatory drugs (NSAIDs) independently damage the stomach lining, and together their risks multiply rather than simply adding up. One study found that the presence of both NSAID use and a history of alcohol abuse led to roughly a tenfold increase in the odds of severe gastrointestinal events, far exceeding what you would expect from adding the individual risks together.¹⁵

Even common over-the-counter doses matter. The risk of upper gastrointestinal bleeding among people who regularly used aspirin was elevated at all levels of alcohol consumption, with higher aspirin doses producing sharper increases in risk.¹⁶ If you take a preemptive ibuprofen before drinking or pop one for a headache during the evening, you are compounding the gastric insult from wine in a way that meaningfully raises your risk. Acetaminophen carries its own alcohol-related risks, primarily to the liver, but is generally less damaging to the stomach lining specifically.

When the Problem Might Be Chronic

Occasional stomach pain after wine is common and usually resolves on its own. But if the discomfort happens every time you drink, or if it has worsened gradually over months or years, the underlying issue may be chronic gastritis rather than a one-off reaction. Research has demonstrated that alcohol is a direct cause of chronic inflammation of the stomach lining, and the severity of the damage is related to how long someone has been drinking excessively, independent of nutritional status, liver health, or immune function.¹⁷

Chronic gastritis can make your stomach increasingly sensitive to triggers that once caused no problems. A glass of wine that was fine five years ago might now cause significant pain because the mucosal lining has been progressively damaged. This is distinct from the acute effects described earlier: even if you stop drinking for a week and feel normal, the underlying chronic inflammation may still be present and will flare with the next exposure. If you suspect this is happening, a conversation with a doctor about endoscopic evaluation is worthwhile rather than just trying to power through it.

Sparkling Wine and the Carbonation Factor

Prosecco, Champagne, and other sparkling wines introduce an additional variable: dissolved carbon dioxide. Carbonation causes the stomach to distend, and research has shown that carbonated beverages shift the distribution of food within the stomach, keeping a greater proportion of both solids and liquids in the upper portion of the stomach for longer.¹⁸ That distension and prolonged retention in the upper stomach can increase the sensation of bloating and fullness, and it may also push more gastric contents toward the lower esophageal sphincter, making reflux more likely.

Many people notice that a glass of Champagne produces more immediate discomfort than the same volume of still wine. The combined effect of fermentation-driven acid stimulation, alcohol’s direct irritation, and CO₂-induced distension creates a triple hit. If you enjoy sparkling wine but find it uncomfortable, drinking it slowly and in smaller volumes helps by reducing the rate of gas release in the stomach.

Practical Ways to Reduce the Pain

Eating before or while you drink is the single most effective way to blunt wine’s effect on your stomach. Food acts as a physical buffer, slowing alcohol absorption and diluting the acid that wine stimulates. Rich or fatty foods are particularly effective at slowing gastric emptying, which reduces the peak acid concentration your stomach lining faces. Drinking water between glasses of wine also helps by diluting alcohol concentration in the stomach.

Choosing your wine deliberately can matter. If reflux is your main problem, you may do better with red wine than white, given white wine’s stronger effect on sphincter pressure. If deep stomach pain and acid are your primary complaint, lower-acid wines or wines with less residual sugar may help. Sticking to one or two glasses rather than three or four makes a substantial difference because the gastric effects of alcohol are dose-dependent. And avoiding NSAIDs before, during, and immediately after drinking removes one of the strongest amplifiers of wine-related stomach damage. If you consistently experience significant pain after even small amounts of wine, that pattern warrants medical attention rather than dietary workarounds.