Does Drinking Through a Straw Cause Acid Reflux? (Yes — Here's Why)

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Mindful-ish · Gut Health

Does Drinking Through a Straw Cause Acid Reflux?

You asked a simple question. The answer involves a valve, a stomach full of air, and a very annoyed esophagus. Let's get into it.

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By Sara Alba April 18, 2026 Brewtiful Living ~6 min read

Quick Answer — for the people who just want to know

Yes — drinking through a straw can cause or worsen acid reflux. Every sip through a straw pulls extra air into your mouth alongside the liquid. That air travels down into your stomach, inflating it. A distended stomach triggers your lower esophageal sphincter — the valve between your stomach and esophagus — to relax and let acid escape upward. That burning sensation is the result. The mechanism is well-documented in peer-reviewed gastroenterology research, and avoiding straws is one of the most consistently recommended lifestyle changes for people with GERD.

First, What Is Acid Reflux Actually?

Acid reflux — formally gastroesophageal reflux, or GER — happens when stomach acid travels backward up into the esophagus. The culprit is a muscle called the lower esophageal sphincter (LES): a ring of muscle between your stomach and esophagus that acts as a one-way valve. When functioning correctly, it opens to let food and drink in, then closes firmly. When it's weakened, under pressure, or triggered to relax — acid gets through.

When this happens occasionally, it's acid reflux. When it happens regularly (at least twice a week), it becomes GERD — gastroesophageal reflux disease. According to the National Institute of Diabetes and Digestive and Kidney Diseases, approximately 20% of Americans have GERD. It's not rare. And a surprising number of everyday habits make it worse — including one you probably do without thinking.

What Does a Straw Actually Do to Your Stomach?

Here's the problem: when you sip through a straw, you don't just pull liquid into your mouth. You pull air, too — every single sip. That air travels the same route as your drink, heading straight into your stomach. The medical term for this is aerophagia: excessive air swallowing.

Once that air is in your stomach, your body has to do something with it. The stomach distends. And here's where it gets directly relevant to reflux: a 2009 study published in Clinical Gastroenterology and Hepatology by Hemmink et al. used 24-hour pH-impedance monitoring — the gold standard for measuring esophageal events — and confirmed that gastric distension directly triggers transient relaxations of the lower esophageal sphincter. In plain English: a stomach full of air is one of the most reliable ways to make your LES valve open when it shouldn't. Acid follows.

Source: Hemmink et al., Clinical Gastroenterology and Hepatology, 2009 — PubMed ID 19602452

Research published in the Journal of Clinical Sleep Medicine reinforced this further, finding that aerophagia and GERD are closely linked — with 77% of aerophagia patients showing GERD symptoms, compared to just 36% of controls. The researchers noted that gastric distension from swallowed air creates a feedback loop: more air leads to more LES relaxations, which leads to more reflux.

Source: Shepherd et al., Journal of Clinical Sleep Medicine, 2012 — PMC3525982

The Chain Reaction, Step by Step

The straw-to-reflux pathway happens in four steps. Tap each one to see exactly what's happening inside your body.

Step 1 You sip through a straw Step 2 Air fills your stomach

The suction mechanism pulls in more than liquid. When you create negative pressure to draw liquid up a straw, air is inevitably pulled in alongside it — especially between sips, when the straw tip isn't fully submerged. The faster you sip, the more air you swallow. This is aerophagia in its most everyday form, and it's happening on every single sip. Source: TUMS / American Gastroenterological Association guidance on gas and bloating

Your stomach is now inflating like a very slow, very uncomfortable balloon. That swallowed air accumulates in your stomach, which stretches its walls to accommodate it. Your body registers this distension as pressure that needs to be relieved — and the options are not dignified. Source: Hemmink et al., Clin Gastroenterol Hepatol, 2009

Step 3 Your LES valve relaxes Step 4 Acid escapes upward

Gastric distension is one of the most reliable triggers of transient LES relaxation. The lower esophageal sphincter relaxes in response to the pressure of a distended stomach — your body is trying to vent the air via a belch. The problem is, the valve can't selectively release only air. Whatever else is in the stomach can come along for the ride. Source: Bredenoord AJ, Practical Manual of Gastroesophageal Reflux Disease, Wiley, 2013

Once the LES opens, stomach acid goes wherever gravity and pressure send it. If you're upright, some acid may still escape — especially if your stomach is full, or if you already have a compromised LES due to GERD, hiatal hernia, obesity, or pregnancy. The result is that familiar burning sensation in your chest or throat. Heartburn. From a straw. Source: NIDDK — National Institute of Diabetes and Digestive and Kidney Diseases, GERD overview

Who Is Most at Risk?

If you're a generally healthy person with no pre-existing reflux issues, sipping your iced coffee through a straw occasionally is not going to give you GERD. Your LES is likely functioning well enough to handle a bit of extra air without a full acid emergency.

But if you already have a weakened or compromised lower esophageal sphincter, straw use is genuinely worth reconsidering. Here's where the assumptions tend to go wrong:

What People Assume vs. What the Research Shows

Common assumption Straws only matter if you're already having major reflux symptoms

What the research says Anyone with mild or undiagnosed GERD can have symptoms worsened by straw use — often without ever connecting the two

Common assumption Straws are recommended for dental health, so they must be fine overall

What the research says Straws do protect tooth enamel from acidic drinks — but this benefit doesn't cancel the aerophagia risk for reflux sufferers. Both things are true simultaneously.

Common assumption Bloating after drinking is just from the drink itself

What the research says A significant portion of post-drink bloating is from swallowed air, not the liquid. Straw users consistently swallow more air than those drinking directly from a glass.

Registered dietitian Lichtman, quoted in EatingWell, put it plainly: "Using a straw can cause you to swallow more air, increasing bloating and pressure on your stomach, which can lead to reflux." This is not a fringe view — it's the consensus position across gastroenterology and nutrition guidance.

This connects to a bigger pattern worth understanding about how your drinking habits — not just what you drink, but how you drink — affect your gut. If you've been using a Stanley Cup or any insulated tumbler with a built-in straw and wondering why you feel constantly bloated, we tracked down exactly what's happening in our piece on how Stanley Cups ruined our gut. The straw that ships with every tumbler is doing the same aerophagia damage — across dozens of sips a day.

What You Can Actually Do

The good news: this is one of the more fixable contributors to acid reflux. No prescription required.

The Brewtiful Verdict

DITCH THE STRAW. HERE'S YOUR ACTUAL GAME PLAN.

If you have GERD or diagnosed reflux: Remove straws from your routine entirely. Drink directly from a glass or a wide-mouth lid. Blue Cross Blue Shield, TUMS, and major gastroenterology guidelines all list straw use as a first-line lifestyle change to address.

If you get occasional heartburn: Pay attention to whether symptoms worsen on days you use straws — particularly with carbonated drinks, which add a second source of stomach gas. Try eliminating straws for two weeks and observe.

If you use a Stanley or insulated tumbler with a built-in straw: Swap the straw lid for a standard sip lid, or drink directly from the opening. The tumbler itself is fine — it's the straw that's doing the damage.

If straws are medically necessary (for dental, swallowing, or accessibility reasons): Talk to your doctor or a registered dietitian about technique — sipping slowly, keeping the straw fully submerged, and not gulping all reduce how much air you take in.

Combine this with the other standard GERD adjustments: smaller meals, staying upright for at least two hours after eating, avoiding trigger foods like caffeine, alcohol, and high-fat meals. Straws are one piece of a larger puzzle — but they're an unusually easy one to remove.

Related Read · Gut Health

The Stanley Cup Ruined My Gut

We loved the tumbler. We did not love what the built-in straw was quietly doing to our digestive system with every single sip. The full, uncomfortable story.

The Bottom Line

Yes — drinking through a straw can cause acid reflux, and the mechanism is specific and well-documented. Straws increase the amount of air you swallow. Swallowed air inflates your stomach. A distended stomach triggers your lower esophageal sphincter to relax. When it relaxes, acid escapes upward. That's heartburn.

For people without reflux issues, the effect is likely mild — mostly manifesting as bloating or the occasional belch. For people with GERD, a hiatal hernia, or a compromised LES, straw use is a meaningful aggravating factor. The research is consistent. The fix is free. Put the straw down.

If you're experiencing frequent or severe acid reflux symptoms, please speak with a doctor or registered gastroenterologist. This article is for informational purposes only and is not a substitute for medical advice.

Sources & Further Reading

1. Hemmink GJ et al. "Aerophagia: excessive air swallowing demonstrated by esophageal impedance monitoring." Clinical Gastroenterology and Hepatology, 2009. PubMed 19602452
2. Shepherd K et al. "Symptoms of Aerophagia Are Common in Patients on CPAP Therapy and Are Related to Nighttime Gastroesophageal Reflux." Journal of Clinical Sleep Medicine, 2012. PMC3525982
3. Bredenoord AJ. "Aerophagia and Belching." Practical Manual of Gastroesophageal Reflux Disease. Wiley, 2013.
4. Bredenoord AJ et al. "Aerophagia, gastric, and supragastric belching: a study using intraluminal electrical impedance monitoring." Gut, 2004. PMC1774303
5. National Institute of Diabetes and Digestive and Kidney Diseases. "Acid Reflux (GER & GERD) in Adults." niddk.nih.gov
6. TUMS. "How to Get Gas Relief." tums.com
7. Blue Cross Blue Shield of Illinois. "Heartburn and Indigestion." bcbsil.com
8. Lichtman RD (via EatingWell). "5 Surprising Habits That Could Make Acid Reflux Worse." September 2024.

This article is for informational and entertainment purposes only. Brewtiful Living is not a medical provider. For persistent or severe acid reflux symptoms, please consult a qualified gastroenterologist or healthcare professional.