Eli5 why is the urge to pee increased when one is submerged in water?
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The urge to pee when one is submerged in water is called **immersion** diuresis. It happens because of two main reasons: **low temperature** and **increasing water** pressure.
When you are in water, your blood vessels in your arms and legs become narrower. This sends more blood to your heart, lungs and other organs. Your body thinks you have too much fluid, so it stops making a hormone that helps you keep water. This makes your kidneys produce more urine to get rid of the extra fluid.
Also, when you are in water, the pressure on your body increases as you go deeper. This squeezes your body tissues and pushes more fluid into your blood vessels. This also makes your kidneys produce more urine.
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