Polyuria Polyuria Polyuria () is excessive or an abnormally large production or passage of urine (greater than 2.5 or 3 L over 24 hours in adults). Frequent urination is usually an accompanying symptom. Increased production and passage of urine may also be termed diuresis. Polyuria often appears in conjunction with polydipsia (increased thirst), though it is possible to have one without the other, and the latter may be a cause or an effect. Psychogenic polydipsia may lead to polyuria. The most common cause of polyuria in both adults and children is uncontrolled diabetes mellitus, which causes osmotic diuresis, when glucose levels
Polydipsia in birds has been experimentally induced in pigeons, budgerigars and ducks, by the administration of lithium chloride (LiCl). The polydipsic effect was greatest in budgerigars, a desert-dwelling species with a well-developed fluid retention system, and least in ducks, a species with an efficient sodium-secretion system. In waterfowl, polydipsia can be a symptom of duck virus enteritis. Polydipsia has also been listed as a symptom of many diseases, including In hens, lesions of the supraoptic hypothalamus of the brain can result in polydipsia. Polydipsia sometimes occurs under housing or experimental conditions which purportedly lead to stress or frustration. Growing parent stock of meat-type