Diuretics are one of the most common causes of severe hyponatremia. Yet, de
spite several relevant studies and years of clinical experience, the mechan
ism and optimal treatment of diuretic-induced hyponatremia remain unclear.
What is clear is that most cases are caused by thiazide rather than loop di
uretics and that severe hyponatremia can develop very rapidly in susceptibl
e patients. In this review, I will discuss the pathogenesis, clinical featu
res, prevention, and treatment of diuretic-induced hyponatremia in the hope
that increased awareness and understanding will reduce the incidence and c
omplications of this potentially life-threatening syndrome.