My Cat Is Losing Weight? What’s Wrong?
- Genna Revell
- 5 days ago
- 2 min read
Step 1: Check the Basics
Before you panic, rule out the easy stuff.
Worms or parasites. Even indoor cats can get them from soil, insects, or contaminated food.
Food quality and freshness. Old or poorly stored food loses nutrients and flavour.
Meal sharing. Make sure another cat isn’t stealing their dinner when you’re not looking.
Dental pain. If chewing looks awkward or food is dropping from their mouth, sore teeth or gums could be the cause.
If any of these apply, book a vet visit to confirm and treat — these are quick wins when caught early.
Step 2: When It’s More Than Food
If your cat is eating normally (or even more than usual) but still losing weight, something medical could be behind it. Here are the common culprits your vet will check for:
Digestive or metabolic causes
Hyperthyroidism. Makes cats burn calories like they’re training for a marathon.
Diabetes. Causes increased appetite, thirst, and weight loss.
Kidney disease. Common in older cats; leads to nausea and reduced appetite.
Liver disease. Often causes dull coats, lethargy, and loss of appetite.
Gastrointestinal disease (like IBD). Stops nutrients from being absorbed properly.
Other possibilities
Cancer. Sadly, unexplained weight loss can be an early warning sign.
Chronic infections or inflammation. These can slow down digestion or change metabolism.
If you’re refilling the water bowl more often or your cat’s energy and appetite have changed, mention that to your vet. It helps narrow the possibilities.
Step 3: Keep a Simple Weight Log
A home weight log gives you real evidence, not just “feels thinner.”
Weigh weekly on a baby or kitchen scale (or by holding them while standing on your own scale).
Record weight, appetite, water intake, and behaviour.
Note vomiting, diarrhoea, or changes in coat quality.
These notes help your vet track progress and spot patterns quickly.
Step 4: When to See the Vet
Book an appointment if:
They’re eating normally but still losing weight
They seem more thirsty or tired
There’s vomiting, diarrhoea, or hair loss
They haven’t been wormed or had a vet check recently
Your vet will likely recommend blood tests, urine tests, and possibly imaging (like ultrasound) to look for internal causes.
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