Polydipsia

Definition

Polydipsia is abnormally excessive thirst and consumption of fluids. It is commonly associated with hyperglycemia, diabetes insipidus, and dehydration.

Causes

• Diabetes mellitus (hyperglycemic osmotic diuresis)
• Diabetes insipidus (decreased ADH)
• Hypercalcemia
• Severe dehydration
• Psychogenic polydipsia
• Medications (lithium, diuretics)

Associated Symptoms

One of the '3 P's' of diabetes: polyuria, polydipsia, polyphagia. May also accompany weight loss, fatigue, blurred vision.

Nursing Interventions

Assess blood glucose, electrolytes, urine specific gravity. Monitor I&O. Identify and treat underlying cause, for diabetes: educate about glucose management. For DI: desmopressin (DDAVP). Address psychogenic causes with mental health referral; caution with free water intake (hyponatremia risk).

NCLEX Relevance

One of the 3 P's of uncontrolled diabetes.