The pathophysiology of primary or psychogenic polydipsia is not clearly understood, although several factors likely play a role, including endocrine disturbances, exacerbation of psychotic symptoms, and impulse control.
Ko, "Psychogenic polydipsia after traumatic brain injury.
Behavioral treatment of psychogenic polydipsia
. J Behav Ther Exp Psychiatry 1988:19(1): 57-61.
Conditions producing psychogenic polydipsia
Key words: psychogenic polydipsia
, hyponatremia, seizure, psychiatric sequelae, anxiety symptoms
However, the hyponatremia observed in some patients with anorexia nervosa is commonly associated with the adoption of purging behaviours (i.e., self-induced vomiting and laxative and diuretic misuse)  or excessive water intake by psychogenic polydipsia
, rather than excessive compulsive exercising .
(PPD) is a chronic, relapsing, and potentially life-threatening disorder characterized by compulsive consumption of large quantities of water resulting in "delutional hyponatremia." PPD occurs in 6% to 20% of psychiatric patients, most often with schizophrenia.
Diabetes insipidus could be caused by a kidney abnormality or one of several central abnormalities, including dipsogenic or psychogenic polydipsia
or the failure of the pituitary to produce antidiuretic hormone.
That helps narrow our differential diagnosis to glucocorticoid deficiency, hypothyroidism, and SIADH (Table 2, page 102).(5) We exclude psychogenic polydipsia
, "tea and toast" syndrome, or beer potomania because they usually present as euvolemic hyponatremia with low urinary osmolality.