Polyuria definition and causes

This is a discussion of one of the common urinary symptoms, Polyuria regarding its definition and common causes .

What is meant by Polyuria ?

This means an increase in urinary output > 3L/day regardless the frequency of micturition.

 Causes of Polyuria

- Diabetes Mellitus (DM) .
- Diabetes Insipidus (DI) .
- Diuretic therapy .
- Psychogenic (polydipsia) .
- Chronic renal failure (C.R.F) (early) .
- Polyuric phase of acute tubular necrosis .

- Severe polyuria will cause thirst, which may be the presenting symptom. 
-  Normal urine volume = 600 ml- 1800 mL/day .
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