Final answer:
Polyuria is defined as excessive urine output, which can be triggered by conditions such as diabetes mellitus and diabetes insipidus, or by the use of diuretics. It is characterized by the production of over 2.5 liters of urine per day and is part of the three Ps that indicate poorly controlled diabetes mellitus.
Step-by-step explanation:
Fluid intake, diabetes, and some medications can increase urine output, a condition called diuresis or polyuria. Polyuria is defined as urine production in excess of 2.5 liters per day. It may be caused by diabetes insipidus, diabetes mellitus, excessive use of diuretics, or diseases of the central nervous system, among others. In the case of diabetes mellitus, high glucose levels in the blood can lead to glucose in the urine, which acts as an osmotic diuretic. This condition is part of the classical trio of symptoms known as the three Ps: polyuria (diuresis), polydipsia (increased thirst), and polyphagia (increased hunger)