SIADH (Syndrome of Inappropriate Anti-Diuretic Hormone) and diabetes insipidus are two disorders that are affected by the anti-diuretic hormone (ADH) but in opposite ways. SIADH and DI are topics covered on the NCLEX exam and in nursing school.
Diabetes Insipidus is an uncommon disorder that causes an imbalance of water in the body. This imbalance leads to intense thirst even after drinking fluids (polydipsia), and excretion of large amounts of urine (polyuria).
Pituitary disorders-Diabetes Insipidus and Cushing's Syndrome