Diabetes insipidus is an uncommon condition in which the kidneys are unable to prevent the excretion of water.
During the day, your kidneys filter all your blood many times. Normally, most of the water is reabsorbed, and only a small amount of concentrated urine is excreted. DI occurs when the kidneys cannot concentrate the urine normally, and a large amount of dilute urine is excreted.
The amount of water excreted in the urine is controlled by antidiuretic hormone (ADH). ADH is also called vasopressin. ADH is produced in a part of the brain called the hypothalamus. It is then stored and released from the pituitary gland. This is a small gland at the base of the brain.
The cause of the underlying condition will be treated when possible.
Central diabetes insipidus may be controlled with vasopressin (desmopressin, DDAVP). You take vasopressin as either an injection, a nasal spray, or tablets.
If nephrogenic DI is caused by medication, stopping the medication may help restore normal kidney function. But with some medications, such as lithium, after many years of use, nephrogenic DI can be permanent.
Hereditary nephrogenic DI and lithium-induced nephrogenic DI are treated by drinking enough fluids to match urine output. Medicines that lower urine output also need to be taken.
Nephrogenic DI is treated with anti-inflammatory medicines and diuretics (water pills).
Outcome depends on the underlying disorder. If treated, diabetes insipidus does not cause severe problems or result in early death.
If your body's thirst control is normal and you drink enough fluids, there are no significant effects on body fluid or salt balance.
Verbalis JG. Disorders of water balance. In: Taal MW, Chertow GM, Marsden PA, et al., eds. Brenner and Rector's The Kidney. 9th ed. Philadelphia, Pa: Elsevier Saunders; 2011:chap 15.
Brent Wisse, MD, Associate Professor of Medicine, Division of Metabolism, Endocrinology & Nutrition, University of Washington School of Medicine. Also reviewed by David Zieve, MD, MHA, Bethanne Black, and the A.D.A.M. Editorial team.