Can Carbonated Drinks Cause Bloating and Gas?

You notice more burping after lunch with a fizzy drink. Was it the bubbles, the sweetener, or the speed at which you finished lunch? Those details belong in the same note, because carbonated drinks and fast eating both appear on the NIDDK’s¹ list of habits that increase swallowed air.¹

Burping, passing gas and a swollen belly differ

A burp releases gas from your stomach through your mouth. Swallowed air that does not leave that way can travel into the intestines and eventually pass as gas. The NIDDK¹ distinguishes bloating, a feeling of fullness or swelling, from distention, an increase in the size of your abdomen. You can feel bloated without a visibly larger belly.¹

That distinction helps you describe what follows the drink: repeated burps, gas from your bottom, uncomfortable fullness, or visible swelling. These are different observations to bring to an appointment.¹

Read the ingredients as well as the bubbles

The NIDDK² lists drinks containing high-fructose corn syrup and products containing sweeteners such as sorbitol, mannitol and xylitol among possible contributors to excess gas. Carbohydrates that are not fully digested can reach the large intestine, where bacteria break them down and produce gas.²

A label with carbonated water alone gives you a different starting point from a soda containing high-fructose corn syrup. If you switch from sweetened soda to still water and feel better, you have changed both carbonation and ingredients. The result cannot tell you which change mattered.²

Our sugar-alcohol ingredient checker can help you identify those names on a label. It does not tell you whether an ingredient caused your symptoms.

What the small sparkling-water trial found

One 2002 randomized study assigned 21 patients with functional dyspepsia and secondary constipation to carbonated water or tap water for almost 15 days. Dyspepsia and constipation scores improved in the carbonated-water group; the tap-water group did not show those improvements.³

This was a small study of people with two particular conditions. It does not establish sparkling water as a treatment for ordinary bloating, and it does not test soda or every flavored sparkling drink. Its findings are a reason to avoid turning a possible trigger into a universal rule.³

The play

Try this: keep a drink entry you can use

The NIDDK¹ recommends a food, drink and symptom diary to help a doctor or dietitian identify possible contributors.²

Record the drink’s name, ingredients and amount, when you drank it, and whether the symptom was burping, passing gas, fullness or visible swelling. Note the meal and drinking pace too. If you change a drink, write down exactly what changed. That makes the comparison easier to interpret.

When to get checked

Don’t wait if

1. Emergency

   A swollen abdomen with sudden severe pain, vomiting blood or severe difficulty breathing needs emergency care. Call 911 or your local emergency number. Those symptoms are not a reason to wait for a drink comparison.⁴

See a clinician if gas symptoms bother you, change suddenly, or come with abdominal pain, constipation, diarrhea or weight loss.¹

The NHS⁴ advises an appointment for repeated bloating or bloating that persists despite dietary changes, including when it comes with unintended weight loss or blood in your stool. Bloating with vomiting, fever, or an inability to pass stool or gas needs urgent assessment.⁴

Keep the drink notes with your Belly Clock

Bloated by Dinner includes the Belly Clock and a Tune It approach to trying one change at a time. Its gas chapter uses the example of switching sparkling water to still water while keeping other habits steady. See the book.