Why Is My Cat Losing Weight?

In this guide

Unlike gaining weight, which tends to creep up slowly and is often welcomed by an owner as a sign of a well fed cat, weight loss usually gets noticed and worried about sooner. That instinct is generally right. Unexplained weight loss in a cat is one of the more reliable signs that something needs a vet's attention.

Common causes

• Hyperthyroidism, more common in older cats, which speeds up metabolism despite a normal or increased appetite
• Diabetes, often paired with increased thirst and urination
• Chronic kidney disease, especially in cats over ten years old
• Dental disease or painful teeth, making eating uncomfortable
• Intestinal parasites, particularly relevant for rescued or street background cats in India
• Inflammatory bowel disease or other digestive conditions
• Cancer, which becomes more likely with age

How much weight loss matters

A drop of more than around ten per cent of body weight over a few weeks to months is significant and worth investigating, even if your cat still seems energetic and is eating normally. Weight loss alongside reduced appetite, vomiting, diarrhoea or lethargy should never be left to resolve on its own.

What a vet visit usually involves

Diagnosis typically starts with a full physical exam and weight history, followed by blood tests to check thyroid levels, kidney and liver function and blood sugar, along with a urine test and a stool check for parasites. Depending on what these show, your vet may recommend an ultrasound or further imaging to look more closely at internal organs.

The bottom line

Weight loss is a symptom, not a diagnosis in itself. It can point to something as manageable as a parasite burden or as serious as organ disease, and the only way to know which is a proper veterinary work up rather than guesswork or a change of cat food at home.

Article content © Ravi Teja. All rights reserved.