health
Why do you always feel like you have to pee when swimming?
It doesn’t matter if you drink less or use the restroom beforehand. Experts say it happens to all swimmers
TL;DR
- Immersion diuresis is the medical term for the increased urge to urinate when submerged in water.
- Cooler water causes blood vessels in the skin to constrict, shifting more fluid towards the core.
- Cardiopulmonary receptors detect the increased fluid volume, signaling the brain to halt antidiuretic hormone (ADH) production.
- Atrial natriuretic factor (ANF) is also secreted, widening blood vessels and increasing water excretion to restore fluid balance.
- The kidneys interpret this as excess fluid and produce more urine.
- This process is a natural reflex to prevent the heart from being overfilled.
- While not dangerous, immersion diuresis can sometimes lead to dehydration.
- Experts suggest there is no real way to prevent immersion diuresis, as it is a normal part of swimming.
- Many swimmers admit to urinating in the pool due to the unavoidable urge.