Psychogenic<unk>  is a type of<unk>  with described in patients with mental illnesses and/or the developmentally disabled. It is present in a subset of schizophrenics.  These patients, most often chronic schizophrenics with a long history of illness, often exhibit enlarged ventricles and shrunken cortex on MRI, making the physiological mechanism difficult to isolate from the psychogenic.  It is a serious disorder and often leads to institutionalization as it can be very difficult to manage outside the inpatient setting.  It should be taken very seriously - it can be life threatening as serum sodium is diluted to an extent that seizures and cardiac arrest can occur.  Patients have been known to seek fluids from any source possible.
Polydipsia differential diagnosis
Cushing's syndrome differential diagnosis
Acromegaly risk factors
Acromegaly differential diagnosis
Diabetes insipidus risk factors
Adrenal insufficiency risk factors
Glucagonoma risk factors
Milk-alkali syndrome differential diagnosis