Polydipsia and polyuria mean drinking and urine output rise together, and in cats the trio of chronic kidney disease, diabetes, and hyperthyroidism tops the list.
Confirm at home by measuring water added and left, plus clump changes; intake above roughly one hundred milliliters per kilogram daily deserves veterinary verification.
Switching to wet food, hot weather, or more activity shifts drinking short term, so rule those out and look for a trend lasting over a week.
Diagnosis takes blood and urine tests, and earlier detection means more management room; never restrict water before diagnosis, as it can dehydrate a polyuric cat.
