Tea can cause stomach pain in some people, primarily through its tannin content, caffeine, and the temperature at which it is consumed. The discomfort typically shows up as cramping, nausea, or a burning sensation and tends to be worse on an empty stomach. The good news is that most tea-related stomach pain is avoidable with straightforward changes to what you drink, how you brew it, and when.
What in Tea Actually Irritates Your Stomach
The main culprits are tannins, caffeine, and catechins, all naturally occurring compounds in the leaves of the tea plant (Camellia sinensis). Tannins are a class of polyphenols that give tea its astringent, slightly bitter taste. When they hit your stomach lining, they can stimulate acid production and, at higher concentrations, irritate the mucosa directly. This is why drinking strong black tea on an empty stomach is one of the most reliable ways to trigger discomfort.
Caffeine plays a supporting role. It relaxes the lower esophageal sphincter, the ring of muscle between your esophagus and stomach, which can allow acid to creep upward. It also stimulates gastric acid secretion on its own. A typical cup of black tea contains roughly 40 to 70 milligrams of caffeine, less than coffee but still enough to matter if you are sensitive or drink multiple cups in a row.
Catechins, especially the one called epigallocatechin gallate (EGCG), are abundant in green tea. At moderate levels they act as antioxidants, but in high concentrations they can stress the stomach lining. Research on a type of oolong tea called Dancong found that fresh, unaged tea aggravated gastric injury in animal models at both low and high doses, while tea that had been stored for six months was gentler at low doses, though still harmful at high ones.1Europe PMC. Low-Dose, Post-Storage Dancong Tea Attenuates Hydroalcohol-Induced Gastric Damage via Modulation Antioxidant and Anti-Inflammatory Pathways The takeaway: how the tea is processed and aged changes its irritant potential, not just what variety it is.
Does Tea Actually Cause Acid Reflux
This is one of the most common concerns, and the research is more reassuring than most people expect. A meta-analysis pooling data from multiple studies found that tea drinking had no significant overall association with gastroesophageal reflux disease (GERD), with an odds ratio of 1.12 that did not reach statistical significance.2PubMed Central. Association between tea consumption and gastroesophageal reflux disease: A meta-analysis That said, geography seemed to matter: the same meta-analysis found a modestly increased risk in East Asian populations and a decreased risk in Middle Asian populations. Diet, genetics, and the types of tea consumed locally all likely contribute to that split.
A separate study looking at nearly two thousand people found that drinking coffee or tea on its own was not linked to reflux symptoms or erosive esophagitis in multivariate analysis. The association only appeared when people drank coffee with milk, and even that link disappeared after adjusting for other factors.3Wolters Kluwer — Medknow Publications. The role of tea and coffee in the development of gastroesophageal reflux disease A Mendelian randomization study on green tea specifically found a suggestive, borderline protective association with gastroesophageal reflux, though the effect was small.4PubMed Central. Causal relationship between green tea intake and gastrointestinal disorders: a two-sample Mendelian randomization study
So if you are blaming your tea habit for chronic reflux, the evidence suggests something else in your routine is more likely responsible. That does not mean tea never triggers reflux in an individual, particularly if you drink it very hot, very strong, or right before lying down. But for most people, moderate tea consumption is not the driver of GERD.
The Temperature Problem
One underappreciated cause of pain after drinking tea has nothing to do with what is in the tea and everything to do with how hot it is. Drinking scalding-hot liquids can physically injure the lining of your esophagus and upper stomach. A documented case report describes a patient who developed diffuse hyperemia and erosions throughout the esophagus after drinking very hot adlay tea, presenting with pain on swallowing and upper abdominal pain.5PubMed Central. Esophageal thermal injury by hot adlay tea The endoscopy showed the classic “candy cane” pattern of alternating red and white bands along the esophageal lining, a signature of thermal damage.
This kind of injury is reversible, but it is also entirely preventable. If you habitually drink tea the moment it is poured, you are exposing your throat and stomach to temperatures that tissue is not designed to handle. The World Health Organization classifies beverages consumed above 65°C (149°F) as probably carcinogenic to humans, specifically because of their link to esophageal cancer over years of repeated exposure. Letting your tea cool for a few minutes is one of the simplest and most impactful changes you can make.
How Brewing Changes What Ends Up in Your Cup
The way you prepare tea meaningfully alters the concentration of the compounds most likely to bother your stomach. A study comparing cold-brewed and hot-brewed black tea found that cold brewing extracted roughly half the total phenolic content and less than half the total flavonoid content compared to hot brewing.6Journal of Food Research. A Comparison of the Polyphenolic and Free Radical Scavenging Activity of Cold Brew versus Hot Brew Black Tea (Camellia Sinensis, Theaceae) In practical terms, cold-brewed tea delivers fewer of the tannins and catechins that provoke stomach irritation while still providing meaningful antioxidant activity. If you enjoy black or green tea but find it harsh on your stomach, switching to cold brewing is worth trying before giving up tea altogether.
Steeping time matters too. A tea bag left in for two minutes produces a noticeably lighter, less tannic brew than one steeped for five or six minutes. The longer the leaves sit in hot water, the more tannins, caffeine, and polyphenols leach into the liquid. For people with sensitive stomachs, shorter steeps are almost always gentler.
Even your water supply plays a role. Research on green tea found that as water hardness increased, the total catechin yield decreased, mainly because the alkaline minerals in hard water promoted the breakdown of certain catechins like EGCG and EGC.7PubMed Central. Effect of Water Hardness on Catechin and Caffeine Content in Green Tea Infusions That may sound like a benefit for stomach sensitivity, but alkaline hard water also caused browning and off-flavors, and caffeine remained relatively stable regardless of water hardness. A study on black tea found that hardness ions actually enhanced the extraction of caffeine and certain catechins while suppressing other compounds called theaflavins.8The Korean Tea Society. Extraction Characteristics and the Correlation of Bioactive Compounds in Black Tea Considering the Mineral Composition of Brewing Water The net effect of hard versus soft water on stomach comfort is not cleanly predictable, but if you have noticed that your tea tastes or feels different after moving to a new area, water chemistry is a plausible explanation.
Herbal Teas as Alternatives and Remedies
Strictly speaking, herbal teas are not true teas since they contain no Camellia sinensis leaves. That distinction matters here because it means most herbal infusions are free of caffeine, tannins, and catechins. For people whose stomach pain is driven by those compounds, switching to an herbal option sidesteps the problem entirely.
Peppermint tea is one of the best-studied options. Animal studies show that it relaxes gastrointestinal smooth muscle and has analgesic effects, which is why it has a long track record as a home remedy for cramps, bloating, and nausea.9PubMed Central. A review of the bioactivity and potential health benefits of peppermint tea (Mentha piperita L.) There is a caveat, though: because peppermint relaxes the lower esophageal sphincter the same way caffeine does, it can worsen acid reflux in people who are prone to it. If your primary symptom is a burning sensation rising into your chest, peppermint might not be the right choice.
Chamomile is another commonly recommended option. It has been used traditionally for a wide range of complaints including gastrointestinal disorders, muscle spasms, and inflammation.10PubMed Central. Chamomile: A herbal medicine of the past with bright future Its anti-inflammatory and mild antispasmodic properties make it a reasonable alternative when your stomach is already irritated, though the clinical evidence in humans remains limited. Ginger tea is another popular option backed by traditional use and some clinical evidence for nausea, though specific sourcing for that is outside our scope here.
Tea Bags and Microplastic Concerns
An emerging concern that most tea drinkers have not considered is what the tea bag itself contributes. Many modern tea bags, especially the silky pyramid-shaped ones, are made from nylon or polyethylene terephthalate (PET) rather than paper. When exposed to hot water, these materials can release microplastics and nanoplastics into your cup. Animal studies have shown that exposure to these particles can trigger intestinal oxidative stress and inflammation, potentially eroding the gut’s mucosal lining and disrupting its barrier function.11Lippincott Open Access / PubMed Central. Health risks posed by microplastics in tea bags: microplastic pollution – a truly global problem
Whether the quantities released from a single tea bag cause noticeable symptoms in a person is still unclear, and the research in humans is in its early stages. But if you drink multiple cups a day from plastic-based bags and experience unexplained low-grade stomach discomfort, switching to loose-leaf tea or paper-based bags removes one variable worth considering. This is an area where the science is genuinely still catching up to the concern.
Tea and Iron Absorption
This is not exactly “stomach pain” in the traditional sense, but it is one of the most important health effects of heavy tea consumption and can indirectly cause abdominal symptoms. The polyphenols in tea, especially tannins containing a galloyl group, bind to nonheme iron in the gut and form insoluble complexes that your body cannot absorb.12PubMed Central. Severe iron-deficiency anemia after short-term moderate consumption of green tea in woman: A rare case report This effect has been recognized for decades and is well documented.13PubMed Central. Iron deficiency anemia due to excessive green tea drinking
For most people drinking a cup or two a day, the effect on iron status is negligible. A pilot trial giving women EGCG supplements (the concentrated form of green tea’s main catechin) found that iron markers like ferritin and serum iron remained largely stable compared to placebo, with no statistically significant differences.14PubMed Central. Effect of Epigallocatechin Gallate Supplementation on Inflammation, Iron Status, and Metabolomic Profiles in Women With Obesity: A Pilot Randomized Controlled Trial But case reports describe iron deficiency anemia developing after even moderate green tea consumption in women who were already at risk due to menstrual blood loss or low dietary iron intake.12PubMed Central. Severe iron-deficiency anemia after short-term moderate consumption of green tea in woman: A rare case report Iron deficiency anemia can cause fatigue, weakness, and yes, GI symptoms including nausea and abdominal discomfort.
The practical advice here is straightforward: avoid drinking tea with meals or within about an hour of eating iron-rich foods. This gives your body a window to absorb the iron before the tannins can interfere. If you are vegetarian, pregnant, or have heavy periods, pay extra attention to this timing because your iron needs are higher and your margin for error is smaller.
Practical Strategies to Reduce Tea-Related Stomach Pain
Rather than giving up tea entirely, you can adjust several variables to find the combination that works for your gut:
- Eat first: The single most effective change. Food in your stomach buffers the impact of tannins and acid. Drinking tea on a completely empty stomach is the scenario most likely to cause pain.
- Shorten your steep: Two to three minutes instead of five or more. You still get flavor and some of the beneficial compounds, but far fewer irritants.
- Try cold brewing: Steeping tea in cold or room-temperature water for several hours extracts substantially fewer tannins and polyphenols while preserving most of the antioxidant capacity.
- Let it cool: Wait until your tea is comfortable to sip rather than gulping it steaming. This protects your esophageal lining from thermal damage.
- Switch varieties: White tea is lower in tannins than black tea. Aged or roasted teas tend to be gentler than their fresh counterparts. Herbal infusions like chamomile avoid the problem compounds entirely.
- Use loose leaf: Beyond potentially reducing microplastic exposure, loose-leaf tea gives you more control over how much leaf you use per cup. Tea bags are often over-dosed for the amount of water they sit in.
- Space it out: Three cups across the day is gentler than three cups in an hour. Spreading your intake reduces the peak concentration of irritants hitting your stomach at any one time.
When to Consider Something Other Than Tea
If you have tried all of the above adjustments and still experience stomach pain after drinking any kind of tea, the issue may not be the tea itself. Chronic stomach pain, persistent nausea, or a burning sensation that does not respond to basic changes warrants a conversation with a doctor. Conditions like gastritis, peptic ulcers, and functional dyspepsia can all be aggravated by tea but have underlying causes that need their own treatment.
It is also worth considering what you add to your tea. Milk can cause cramping in people who are lactose intolerant, sweeteners (especially sugar alcohols like sorbitol, sometimes found in “diet” tea blends) can trigger bloating and diarrhea, and certain flavored teas contain citric acid or other additives that are more irritating than the tea itself. If your stomach is fine with plain loose-leaf tea but not with a pre-flavored tea bag, start reading ingredient labels before assuming the problem is “tea.”
Finally, the dose matters more than most people realize. A person drinking one or two cups of properly brewed tea a day is in very different territory from someone consuming a liter of strong green tea on an empty stomach. Many of the case reports and animal studies showing harm involve quantities or concentrations well beyond what a casual tea drinker encounters. For the vast majority of people, tea is gentle enough to be a daily habit with small adjustments, and the research on its long-term health effects is generally favorable.