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how come?

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Daave | 11:39 Mon 04th Dec 2006 | Science
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when i have a bath sometimes, i need a pee as soon as i sit in the water...

what triggers that and why?
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The medical phrase for this condition is immersion diuresis. I used to do quite a bit of diving in my younger days and this phenomenon is considered to be a right pain in the neck (and other places) by most divers.

In simple terms, what happens is that the blood vessels in the extremities and skin become constricted following immersion. This leads to an increase in the volume of blood sent to the main organs of the body such as the liver, heart, and lungs.

The body contains a hormone called ADH, which regulates the quantity of urine the body produces. The body senses the increased blood volume and assumes that there is an excess of fluid in the circulation. This in turn, leads to ADH production stoppage. Without ADH, the kidneys are able to work at their maximum capacity to remove fluid from the circulation via the collecting tubule. The result of this is that urine volume is increased, the bladder is rapidly filled and you get the feeling that you need to empty your bladder urgently.

I should add though that if this condition is something you�ve recently developed, you should see a GP as it can be a sign of a urinary tract infection.

Don't share the bathwater!

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wow, so i have urinary tract infection maybe?

hmm, what other symptoms of that are there?
cause it doesnt hurt to wee or anything,
WoW I get that too.
What I meant to say was that we all suffer from immersion diuresis to some degree but the situations when it arises may not be the same for all of us.

Immersion diuresis in itself does not mean you have a UTI. However, if you've never suffered greatly from immersion diuresis but it's becoming more frequent lately when you submerge your body in bathwater, it may mean that you've recently picked up a UTI.

Other UTI symptoms may include a need to urinate frequently (apart from in the bath), pain or burning in the bladder or urethra area during passing of urine and feeling tired/lethargic all the time. I'm not a doctor of medicine, so you would be wise to contact your GP if you've got these symptoms.

Having said that, it sounds to me like you've got common or garden immersion diuresis just like the rest of us.

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