What Pop Helps An Upset Stomach Flat Vs Fizzy?

When your stomach is churning, the last thing you want is to make it worse with the wrong drink. The short answer is that flat soda is generally better for an upset stomach than fizzy soda, but the evidence supporting either one is thinner than most people think. Carbonation can cause bloating and gas, which often makes nausea and stomach discomfort worse, while letting the bubbles escape removes that particular problem.

What Pop Helps An Upset Stomach Flat Vs Fizzy?

Flat soda is the better choice when you are dealing with an upset stomach. The carbonation in fizzy drinks creates gas in your digestive tract, which can lead to bloating, belching, and increased pressure in your stomach. For someone already feeling nauseous or crampy, adding gas to the mix rarely helps.

That said, the idea that any soda settles the stomach is largely a cultural belief passed down through generations, not a medical recommendation. Healthcare providers stopped recommending soda for stomach issues decades ago. The sugar in regular soda can draw water into the intestines and worsen diarrhea, while the acidity can irritate an already inflamed stomach lining.

Why Carbonation Causes More Problems

Carbon dioxide gas is dissolved into soda under pressure. When you drink it, that gas expands inside your stomach. Your stomach has to work to push that gas out, either through belching or by passing it through the digestive tract.

For a healthy person, this is mostly harmless. For someone with an upset stomach, it can be miserable. The extra gas stretches the stomach wall, which can amplify feelings of nausea. If you are already bloated or cramping from a stomach bug, indigestion, or food poisoning, carbonation adds a new layer of discomfort on top of what you already feel.

Some research has looked at whether carbonated water affects digestion, and the findings suggest it can increase belching and bloating in sensitive individuals. The same logic applies to soda. Removing the carbonation removes that specific problem.

Does Sugar Help or Hurt an Upset Stomach?

There is no evidence that sugar settles a stomach. In fact, sugar can make certain stomach problems worse.

High-sugar drinks pull water into the intestines through osmosis. This can make diarrhea worse or even trigger it in someone who was not experiencing it before. For nausea, a sudden spike in blood sugar followed by a crash can make you feel dizzy and more unwell.

Some people recommend flat ginger ale or flat cola for an upset stomach, but the active ingredient they are thinking of — ginger — is not present in meaningful amounts in most commercial ginger ales. Many brands contain little to no actual ginger, and the ones that do have small quantities that may not be enough to have a measurable effect.

If you want the potential benefits of ginger for nausea, ginger tea brewed from fresh ginger root or standardized ginger supplements have more evidence behind them. Research on ginger for nausea has focused mostly on pregnancy-related nausea and chemotherapy-induced nausea, with some studies showing modest benefit. The evidence for ginger on general stomach upset is less clear.

What Actually Helps an Upset Stomach

If soda is not a reliable option, what should you drink instead? The answer depends on what is causing your upset stomach, but some general principles apply.

Clear liquids are the standard recommendation. Water is always safe. Small sips are better than large gulps, especially if you are nauseous. Drinking too much at once can trigger vomiting in someone who is on the edge.

Oral rehydration solutions are the evidence-backed choice if you have diarrhea or vomiting. These drinks contain a specific balance of water, salt, and sugar that helps your intestines absorb fluids more effectively than plain water. Commercial products like Pedialyte are designed for this purpose. Sports drinks are not equivalent — they contain too much sugar and not enough electrolytes for rehydration after significant fluid loss.

Broth or clear soups can provide fluids and some salt. Herbal teas like peppermint or chamomile are commonly used, though the evidence for their effectiveness is limited. Peppermint oil in capsule form has more research behind it for irritable bowel syndrome symptoms, but that is different from drinking peppermint tea during an acute stomach upset.

When to Skip Soda Entirely

There are situations where no soda — flat or fizzy — is appropriate.

If you have been vomiting repeatedly or have had diarrhea for more than a day, soda is not the answer. You need fluids with the right balance of electrolytes and sugar. Plain soda water lacks electrolytes. Regular soda has too much sugar. Diet soda has artificial sweeteners that can cause diarrhea in some people.

If your stomach pain is severe, if there is blood in your vomit or stool, or if you cannot keep any fluids down for more than 12 hours, you should seek medical care. These can be signs of a more serious condition that requires professional evaluation.

For children, soda is particularly not recommended. Pediatric guidelines do not support giving soda to children for stomach upset. Oral rehydration solutions are the recommended option for children with vomiting or diarrhea.

Does Flat Soda Actually Work or Is It Just Tradition?

There is no clinical evidence that flat soda settles an upset stomach. This is important to state clearly because many people believe it works based on family tradition rather than science.

What flat soda does do is provide fluids and sugar. If you have been vomiting or have diarrhea, you do need fluids and some sugar for energy. But the same can be said for many other drinks that are less acidic and less processed.

The acidity of soda can be a real issue. Most sodas have a pH between 2.5 and 3.5, which is highly acidic. For someone with gastritis, an inflamed stomach lining, or acid reflux, drinking something that acidic can worsen irritation. Flat soda is still acidic — removing the bubbles does not change the pH.

Some people find that sipping small amounts of flat cola helps settle their stomach. This may be real for them personally, but it is not evidence that it works for everyone. Individual experiences vary, and what works for one person may not work for another.

What About Ginger Ale Specifically?

Ginger ale is the most commonly recommended soda for upset stomachs, but it deserves special attention because it is often recommended for the wrong reasons.

Most commercial ginger ales contain very little actual ginger. The flavor in many brands comes from artificial flavoring, not real ginger root. Even brands that do contain ginger usually have it in small amounts.

The ginger in ginger ale that could theoretically help with nausea is present in quantities far too small to have a meaningful effect. If you want the potential anti-nausea benefits of ginger, you would need to consume it in much higher concentrations, such as ginger tea made from fresh ginger root or a standardized ginger supplement.

Some research has examined ginger for nausea in pregnancy and after surgery, with mixed but somewhat positive results. The evidence is not strong enough to recommend ginger as a reliable treatment for all types of nausea. And even where ginger shows benefit, that benefit does not translate to commercial ginger ale.