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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.
Smoking can also lead to irritation of the lining of the stomach causing abdominal pain. Carbonated beverages can cause irritation of the lining of the stomach causing abdominal pain. Discuss your symptoms with a doctor to see what other modifications may help.