In diagnosis,<unk>  is usually categorised as: * Psychogenic (PPD) – caused by underlying psychiatric symptoms, including those caused by psychoses and rarely by affective disorders * Non-psychogenic – another non-psychological cause, including idiopathic (unknown cause) The terms<unk>  and psychogenic<unk>  are sometimes incorrectly used interchangeably – to be considered psychogenic, the patient needs to have some other psychiatric symptoms, such as delusions involving fluid intake or other unusual behaviours.<unk>  may have physiological causes, such as autoimmune hepatitis. Since<unk>  is a diagnosis of exclusion, the diagnosis may be made for patients who have medically unexplained excessive thirst, and this is sometimes incorrectly referred to as psychogenic rather than<unk> .
Primary polydipsia
Syndrome of inappropriate antidiuretic hormone secretion
Diabetic hypoglycemia
Reactive hypoglycemia
Idiopathic hypoglycemia
Ketosis-prone diabetes
Central diabetes insipidus
Nephrogenic diabetes insipidus