Thyroid UK
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Water Retention?

Morning all

I've been on the new t3 (mercury pharma) since tuesday of last week. They are only 20mcg per tablet so I've been taking 2 a day (40mcg, was on 37.5mcg before). Been feeling good considering a hectic week travelling to Wales, South West and Scotland in 6 days!

I've always drank a lot of water. I don't drink tea/coffee (caffeine makes me a little jittery) and rarely have juice/soft drinks (unless it's in a very alcoholic cocktail). Anyhow usually in cooler months my in take is about 4 litres, 5 max. Yesterday I drank about 6.5-7 litres. It's not the most unusual thing but what my colleagues highlighted is if they drank that much they would be off to the loo all day. I don't have that problem.

Is this a water retention thing? Is there anything I should take?

Thanks all x

10 Replies

Pennyrose, that's excessive water consumption and could be flushing your system of nutrients. 2-3 litres daily is generally recommended.

Excessive thirst and consumption may be a sign of diabetes so I would recommend you have this checked out.

Water retention usually shows as bloating.


Thanks Clutter

I'm quite bloated and ankles are a bit fat! Spoke to the GP about it a couple of years ago and diabetes test was ok (they tested last year too and all was fine). Might bring it up again!


There are other reasons why you shouldn't drink that much fluid. I got told off by a hospital consultant for drinking only four litres. I can't remember the explanation but it can actually cause serious problems with your kidneys and hormones.


Thanks lovely. I just get a very dry mouth and throat and my pee gets really dark if I don't have at least 4litres a day!


If your pee is colourless, it means you've peed out all your trace minerals and nutrients.

Dry mouth can be a symptom of low thyroid. Un/Under-treated hypos can get very thirsty. Do you have any blood tests to share with us? How are your sodium and potassium levels?


Ah. That's not good. The thirst can get bad and I have a cold this week that isn't helping.

My last bloods were 2 months ago but I imagine they are much better now.

TSH: 3 (0.5-4.5).

T4: 9 (9-23)

T3: 4 (3.8-6.9)

Feeling much better. Haven't ever had sodium and/or potassium checked. I remember when I first got ill I was craving salt and sometimes I do have bouts of that.

In the process of trying to find a better GP in york so when I move will discuss all with them. Thank you Goose x


You should definately ask for sodium/potassium tests. The balance has to be just right between those two.

Well, your last labs weren't good, were they? FT4 and FT3 are very, very low. I don't know how you managed to get out of bed in the morning with labs like that! Certainly could explain your thirst.

Salt cravings are a symptoms of low adrenals. A cortisol test would be in order.

Hugs, Grey


Your water consumption appears to be massively too high.

I suggest that you have a read of this story to understand how serious the issue can be:

If you need help, I'd hope your GP would be able to do so.



Hi Rod

That's quite a horrific tale! And she was only on 6 pints (about 3.4 litres). From as long as I remember I've always drank a lot but intake definitely increased in when I was 19 (about 11 years ago) and in my 2nd year of uni. I'd have pints of water in the union bar while the guys were on beer. I guess it's just become normal.

It only dawned on me the other day that considering how much liquid I drink, I don't need the loo that often! TMI?

Thanks Rod x


Poor woman was probably mildly hypo. I would never trust anyone that said they were any sort of 'nutritionist'! Been there, done that...


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