Primary polydipsia

Primary polydipsia and psychogenic polydipsia are forms of polydipsia^[1] characterised by excessive fluid intake in the absence of physiological stimuli to drink.^[2] Psychogenic polydipsia caused by psychiatric disorders—oftentimes schizophrenia—is frequently accompanied by the sensation of dry mouth. Some conditions with polydipsia as a symptom are non-psychogenic (e.g., early Type 2 diabetes, primary hyperaldosteronism, and zinc deficiency, and some forms of diabetes insipidus). Primary polydipsia is a diagnosis of exclusion.