So, if the science says it’s mild, why does it feel like a bonfire for some of us? The answer isn’t the acid—it’s the pressure. That bubbly sensation can cause your stomach to distend, or stretch, more than still water does.
When your stomach stretches, it can put pressure on the lower esophageal sphincter (LES). Think of the LES as the gatekeeper between your stomach and your esophagus. If the gate gets jostled open, stomach acid can splash upward, and that’s the heartburn you feel.
It’s a mechanical issue, not a chemical one. The bubbles don’t create new acid; they just sometimes encourage the existing acid to take an unwelcome road trip.
The Secret Ingredient: Acid (and Flavor)
Here’s where it gets tricky and a little sneaky. Many store-bought sparkling waters, especially flavored ones, contain citric acid or phosphoric acid. These are added to give that zesty, sour kick—think lemon, grapefruit, or berry flavors.
Unlike the gentle carbonic acid, these added acids are much stronger and can directly irritate an already sensitive esophagus. If you’re sipping a lime-flavored seltzer and feeling the burn, the bubbles might be the scapegoat, but the citric acid is often the real culprit.
Gallbladder Issues And Heartburn: Does Drinking Water Worsen Symptoms
It’s like blaming the car for the traffic jam when the real problem is the detour. The carbonation is the car; the citric acid is the detour that leads straight to heartburn city.
