CBSE Class 10 Answered

Diabetes Insipidus (DI) is a disorder in which there is an abnormal increase in urine output, fluid intake and often thirst.  It causes symptoms such as urinary frequency, nocturia (frequent awakening at night to urinate) or enuresis (involuntary urination during sleep or bedwetting).

Diabetes Insipidus is divided into four types, each of which has a different cause and must be treated differently.  The most common type of DI is caused by a lack of vasopressin, a hormone that normally acts upon the kidney to reduce urine output by increasing the concentration of the urine.  This type of DI is usually due to the destruction of the back or "posterior" part of the pituitary gland where vasopressin is normally produced.  Hence, it is commonly called pituitary DI.