Polyuria is a condition characterized by the passage of large volumes of urine (at least 2.5 liters in 24 hours in adults), which results in profuse urination and urinary frequency. Polyuria is a fairly common symptom, which is often noticed when you have to get up to use the bathroom at night.
Polyuria often appears in conjunction with polydipsia (increased thirst), but it is also possible to have one without the other, and the latter may be a cause or an effect. Psychogenic polydipsia may lead to polyuria.
Polyuria is physiologically normal in some circumstances, such as cold diuresis, altitude diuresis, and after drinking large amounts of fluids.
The causes of polyuria are: diabetes mellitus; increase in fluid intake, especially water; diuretic drugs; diuretic foods (foods and beverages containing caffeine, such as chocolate, coffee, tea, and soft drinks; diabetes insipidus; psychogenic polydipsia; high doses of riboflavin (vitamin B2); high doses of vitamin C; cold diuresis.