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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.
Also, if the stomach discomfort is due to a buildup of acid (i.e. if you have heartburn or GERD), coke will not help, and it may actually aggravate the situation. Coke can, however, provide relief if your nausea is caused by something as simple as gas buildup.