Water intoxication in psychiatric patients.

Compulsive water drinking is associated with a broad spectrum of psychopathology, from mild neurosis to psychosis. Since the normal kidney is capable of excreting large volumes of fluid rapidly, water intoxication requires both a pathological basis and a psychiatric explanation of why so much water is being taken. Excessive water consumption can be dangerous, so that the fluid intake of patients with a history of polyuria together with a low urinary specific gravity should be closely observed. Four cases of water intoxication resulting from psychogenic polydipsia are described, three of them in chronic schizophrenics, where inappropriate ADH secretion might represent part of the psychosis.