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The extra gas in carbonated water creates more pressure in your stomach, increasing the chances that your stomach will regurgitate contents upward. Some carbonated waters also include natural flavorings, such as lemon or lime, which can increase acidic content, making the heartburn worse.
Bloat from carbonated water. For one to three hours after drinking carbonated water, you may feel as though your belly has expanded. The carbonation can make your stomach look distended and cause clothing to fit more snuggly around your midsection.