Sweet tea is not good for acid reflux. It combines three ingredients that can each trigger or worsen heartburn on their own: caffeine, tannins, and a high concentration of sugar. Together, they make sweet tea one of the more problematic beverages for people dealing with reflux symptoms. That said, how you prepare your tea and what you put in it can shift the equation significantly.
Why Caffeine in Tea Relaxes the Valve That Blocks Acid
Your esophagus has a ring of muscle at its base called the lower esophageal sphincter. This valve opens to let food into your stomach and closes to keep stomach acid from flowing back up. Caffeine relaxes that valve, allowing acid to escape into the esophagus. Black tea, the base for most sweet tea, contains roughly 40 to 70 milligrams of caffeine per cup, enough to weaken the sphincter in people who are already prone to reflux.
A large study of women’s health found that those who drank the most tea (six or more servings per day) had a 26% higher risk of developing reflux symptoms compared to non-drinkers. Interestingly, more than 5% of participants in the study reported heartburn or regurgitation specifically after drinking tea. When researchers modeled what would happen if people swapped just two daily servings of tea for water, the predicted risk of reflux symptoms dropped measurably.
What Sugar Does to Your Stomach
A standard glass of Southern-style sweet tea can contain 20 to 30 grams of sugar, sometimes more. That sugar load matters for reflux in a couple of ways. High-sugar liquids can slow the rate at which your stomach empties its contents into the small intestine. When food and liquid sit in the stomach longer, there’s more opportunity for acid to push upward, especially if you’re lying down or bending over after drinking.
Sugar also contributes to weight gain over time, and carrying extra weight around the midsection increases pressure on the stomach. That pressure is one of the most consistent physical drivers of chronic reflux.
Tannins Can Irritate an Already Sensitive Esophagus
Black tea is rich in tannins, the compounds responsible for its slightly bitter, astringent taste. In someone with healthy tissue, tannins pass through without much issue. But in someone who already has reflux and possible irritation of the esophageal lining, tannins can make things worse. They interact with the protective mucus layer that lines the digestive tract, stripping it away and leaving the tissue underneath more exposed. Research from Cambridge University Press describes how tannins consumed in liquid form react with proteins in the lining of the alimentary tract, causing cellular damage. The astringent effect you feel on your tongue can occur undetected further down in the esophagus.
This doesn’t mean a single cup of tea will damage your esophagus. But if you’re drinking sweet tea regularly and already experiencing heartburn, tannins are adding an extra layer of irritation on top of the caffeine and sugar.
How Cold Brewing Changes the Picture
If you’re reluctant to give up tea entirely, how you brew it matters. Cold-brewing tea (steeping leaves in cold or room-temperature water for several hours instead of using boiling water) produces a noticeably different drink. The lower temperature prevents much of the tannin release that happens during hot brewing, resulting in a smoother, less acidic cup. Cold-brewed tea is generally easier on the stomach and may be a better option for people with digestive sensitivities.
Cold brewing won’t eliminate caffeine entirely, but the gentler extraction does reduce the overall harshness of the tea. If you then sweeten it lightly rather than heavily, you’ve removed two of the three main triggers.
Better Sweetener Options
Replacing some or all of the sugar in your tea with a sugar substitute can reduce the reflux-related effects of a high sugar load. Options like stevia, sucralose, and monk fruit sweetener let you keep the sweetness without the same impact on gastric emptying or calorie intake. These won’t fix the caffeine or tannin issue, but they remove one variable from the equation.
Teas That May Actually Help
Not all teas are created equal when it comes to reflux. Ginger tea is one of the better-studied alternatives. Ginger contains natural compounds with anti-inflammatory properties that may reduce irritation in the esophagus and lower the production of stomach acid. It also appears to speed up gastric emptying, moving food out of the stomach faster and reducing the window for acid to reflux upward. On top of that, ginger can ease nausea, bloating, and upper abdominal discomfort, all symptoms that often accompany reflux.
Chamomile tea is another caffeine-free option that many people with reflux tolerate well. Since it contains no caffeine and minimal tannins, it avoids the two biggest chemical triggers in black tea. The key is choosing herbal teas that are naturally caffeine-free rather than simply switching to green or white tea, which still contain caffeine, just in lower amounts.
The Practical Takeaway
Sweet tea hits three reflux triggers at once: caffeine relaxes the valve that keeps acid in your stomach, sugar slows digestion and adds abdominal pressure over time, and tannins irritate tissue that may already be inflamed. If you’re experiencing regular heartburn, sweet tea is one of the easier swaps to make. Cold-brewed, lightly sweetened tea is a step in the right direction. Caffeine-free herbal teas like ginger or chamomile are a bigger step. And replacing two daily servings of any caffeinated tea with water is, based on the available data, one of the simplest ways to lower your risk of reflux symptoms.