Symptoms of too little fluid and too much fluid
The main symptom of too little fluid is thirst. Others include:
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not passing very much urine, urine is dark and strong-smelling
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dry or sticky mouth, coated ('furry') tongue, cracked lips
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feeling dizzy, especially when you stand up.
The symptoms of too much fluid include:
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passing a lot of urine
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swollen ankles
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feeling breathless, especially when you lie flat.