Polyuria

DDx

Osmotic diuresis: diabetes mellitus, mannitol infusion, radiocontrast media, high-protein tube feeds
Drugs: diuretics, lithium, caffeine
Diabetes insipidus
Hypercalcemia, eg, hyperparathyroidism
Psychogenic polydipsia (eg, schizophrenia)
Excess IV fluids
Chronic renal failure (early)
Diuretic phase of acute tubular necrosis (ATN)
Hypokalemia
Post-transurethral resection of the prostate
Cushing’s syndrome
Primary hyperaldosteronism
Inability to concentrate urine: sickle cell trait or disease, chronic pyelonephritis, amyloidosis
Anxiety

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