Polyuria after relief of urinary tract obstruction (frequently Foley catheter placement)
Some patients may experience hematuria, which is rarely clinically significant
Post-obstructive diuresis
Osmotic diuresis
Contrast-induced nephropathy
Hyperglycemia
Dialysis-associated hypotension
Mannitol
Dehydration 
Drugs: diuretics, caffeine, acetazolamide, lithium