This document discusses diabetes insipidus (DI), a disorder caused by a deficiency of antidiuretic hormone (ADH) characterized by excessive thirst and urination. There are two types: central DI caused by head trauma or pituitary issues reducing ADH production, and nephrogenic DI caused by kidney problems inhibiting ADH response. Symptoms include urinating large volumes of dilute urine and increased thirst. Diagnostic tests show high serum osmolality and low urine osmolality. Treatment aims to replace ADH through DDAVP nasal spray or IV, correct dehydration, and identify underlying causes.