When the water bowl empties noticeably faster than it used to, treat that change as information, not a quirk. In cats, a real rise in drinking most often traces back to the kidneys, an overactive thyroid or diabetes — conditions that also make her urinate more — though urinary infections, liver trouble, fever and some medicines can sit behind it too. Because cats are desert-descended and naturally low drinkers, an owner-visible change usually means a real change: the bowl emptying faster, drinking from taps and glasses, or noticeably larger urine clumps in the litter tray. Measure rather than guess if you can: filling the bowl with a known amount and checking what is left after 24 hours gives your vet real data.
What the Vet Will Do With That Information
Increased thirst plus increased urination in a middle-aged or older cat triggers a standard, sensible workup: examination and weight check, blood tests (kidney values, thyroid hormone, blood sugar), and a urine sample — often enough to identify which of the big three it is, and all three are far more manageable when caught early. Note the accompanying signs that help: weight loss despite a good appetite (thyroid or diabetes), appetite loss and dull coat (kidney), or straining and small frequent urinations (urinary tract). Do not restrict water while you wait for the appointment — a thirsty cat needs to drink.
Working With Your Vet
With increased thirst, bring numbers rather than impressions. Set down when you first noticed the bowl emptying faster, the measured amount she drinks across a full day if you have tracked it, how many urine clumps you are scooping, and whether weight, appetite or coat have shifted alongside. Those specifics help your veterinarian choose and interpret the blood and urine tests that can distinguish kidney trouble, thyroid disease and diabetes, instead of starting from a general worry that she seems thirstier than before.
Book an appointment within days, not weeks, for a clear thirst increase — sooner for a cat who is also losing weight, off food, vomiting, or lethargic. This is general information about a common sign; the cause in your cat can only be identified by examination and tests, which is exactly why the sign deserves them.
Track the drinking itself, day by day, and the habit soon repays the effort. Note each refill and roughly what remained, count the larger litter clumps, and jot down meals eaten and any change in energy. Set against the week before, those entries reveal whether intake is still climbing, holding steady or easing, and they give the clinic a timeline that memory alone would blur. Look back over them whenever her routine shifts — a hotter spell, a new food, a new medication — because each can move her baseline and change what counts as unusual for her.
Bringing that thirst timeline to the appointment changes the conversation. Filed in KinsLe's Pet Passport alongside her vaccination record, test results and earlier visit notes, it travels as one portable packet — to the clinic, into boarding, or on a trip — so every carer works from the same drinking history.