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It could be caused by water vapor filling up the stomach. If it's a long shower the increase in volume could be stretching your stomach to the point of causing discomfort. Also, if the shower is with hot water this effect would be amplified since the equation PV = nRT says the hotter the vapor the more pressure it will exert on the walls of a container (like your stomach).

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10y ago

What else can I help you with?