Coffee can cause heartburn because it’s naturally acidic, it can relax the valve between your stomach and esophagus (the LES), and its caffeine stimulates stomach acid. Stale coffee and drinking on an empty stomach make it worse. The good news: a few simple changes — fresher beans, lower-acid options, cold brew, and eating first — let most people enjoy coffee without the burn.
One underrated factor is freshness. Much store-bought and chain coffee sits for months before you drink it, and stale coffee develops rancid oils that are harsher on the stomach. Switching to freshly roasted coffee from a local roaster like Berk’s Beans can make a real difference in how your body reacts. Below, we break down why it happens and how to prevent it.
Why Does Coffee Cause Heartburn?
1. Coffee’s natural acidity
Acidity is a natural characteristic of coffee, and while many people enjoy the bright flavors, it can trigger reflux and heartburn in sensitive individuals. Acidity varies by bean, roast, and freshness — lighter roasts are more acidic than darker ones, and stale coffee of any roast tends to be harsher on the stomach. Learn more in our guide to coffee acidity.
2. Stale, low-quality coffee
Much store-bought and chain coffee sits on shelves or in warehouses for months before reaching your cup. Over time it goes stale and develops rancid oils that can irritate digestion. Coffee doesn’t spoil, but it does go stale — so always check the roast date and aim to drink coffee within about 30 days of it. Roast-to-order coffee is fresher and often gentler on the stomach.
3. Its effect on the lower esophageal sphincter (LES)
The LES is the muscular “gate” between your stomach and esophagus. When it works properly, it keeps stomach acid from traveling back up. Coffee — especially in large amounts — can relax the LES, letting acid escape and cause that burning sensation. This is why people prone to acid reflux often struggle with coffee.
4. Caffeine’s effect on digestion
Caffeine stimulates gastric acid production. For sensitive stomachs, that extra acid can mean bloating, discomfort, and heartburn. Some people do fine; others may need to moderate intake or switch to a half-caff or decaf option.
How to Prevent Coffee-Related Heartburn
- Choose freshly roasted coffee to avoid the stale, rancid oils that worsen irritation.
- Pick a low-acid option — a darker roast or a naturally low-acid origin. See our low-acid coffee guide and low-acid coffee for reflux.
- Try cold brew — it’s naturally lower in acid and smoother (here’s how to make it at home).
- Don’t drink it on an empty stomach — have a small snack first to buffer stomach acid.
- Experiment with dairy alternatives like almond, oat, or coconut milk if dairy is part of the problem.
- Use a paper-filter method like pour-over, which removes some of the oils that add to acidity.
- Drink in moderation — spacing out one or two cups beats a big dose at once.
- Add a buffer — a pinch of cinnamon (or, for some, a tiny pinch of baking soda) can take the edge off.
Frequently Asked Questions
Why does coffee give me heartburn?
Coffee is acidic, can relax the LES valve, and its caffeine stimulates stomach acid — a combination that can push acid up into the esophagus, especially on an empty stomach or with stale beans.
What coffee is easiest on the stomach?
Fresh, low-acid coffee — a darker roast or a naturally low-acid origin like Brazil or Sumatra — and cold brew, which is naturally less acidic than hot coffee.
Does cold brew cause less heartburn?
For many people, yes. Cold brew’s slow, cold extraction produces a naturally lower-acid cup that’s often gentler than hot-brewed coffee.
With a few small adjustments, most people can keep enjoying coffee without the burn. If heartburn is frequent or severe, though, check with a doctor — persistent reflux can need medical attention. Start with fresh, quality beans: explore our roasts, roasted to order in Concord, CA.
