12 Common Reasons Why Cats Lose Weight

A cat losing weight can be a concerning situation. Weight loss in cats, especially when it’s sudden or prolonged, often indicates an underlying health issue. It may be a sign of various conditions, including dental problems, gastrointestinal disorders, diabetes, hyperthyroidism, or even cancer.

Since cats are skilled at hiding illness, any noticeable weight loss is a major red flag. Prompt veterinary attention is crucial to identify the cause, initiate necessary treatment, and prevent further health complications. Monitoring your cat’s weight and addressing any changes promptly can significantly contribute to their overall well-being and quality of life.

Tackle the issue and also consider being prepared with pet insurance. The best pet insurance covers a feline for comprehensive health conditions up to the benefit limit, so consider it. Meanwhile, read this article to learn about the most common reasons cats lose weight.

Why do cats lose weight?

Cats can lose weight for various reasons, and it’s essential to identify the underlying cause early. Some of the prevalent reasons are listed below.

1.Dietary issues

Inadequate or poor-quality food, as well as feeding problems like food allergies, intolerances, or malabsorption, can lead to weight loss.

2.Dental problems

Painful dental issues, such as gum disease or tooth decay, can make it difficult for cats to eat, leading to weight loss.

3.Gastrointestinal disorders

Conditions like inflammatory bowel disease (IBD), gastrointestinal infections, or parasites can disrupt digestion and nutrient absorption, causing weight loss.


An overactive thyroid gland can increase a cat’s metabolism, leading to weight loss despite increased appetite.

5.Insulin resistance

Diabetes mellitus can result in weight loss, increased thirst, and excessive urination.


Various types of cancer can cause weight loss in cats due to metabolic changes and decreased appetite.


Stressors like abrupt/significant changes in the environment, new pets, or social stress can affect a cat’s eating habits.

8.Chronic illnesses

Underlying chronic conditions like kidney disease, liver disease, or heart disease can lead to weight loss as the body’s metabolism is affected.


Intestinal parasites, such as worms or protozoa, can deprive cats of nutrients, leading to weight loss.


Older cats may experience age-related weight loss as their metabolism slows down and muscle mass decreases.

11.Dieting/reduced appetite

Cats on restricted diets or those with reduced appetite may lose weight.


Systemic infections or chronic illnesses can result in weight loss as the body diverts energy to fight the infection.

If you notice your cat losing weight suddenly, contact a veterinarian asap. An accurate diagnosis is crucial to identify and address the root cause, ensuring your cat receives relevant treatment and care to regain and maintain a healthy weight.

Note that prolonged weight loss in cats can lead to significant health risks and complications. These include muscle wasting, weakened immune function, reduced energy levels, and decreased overall vitality.

Be vigilant regarding your cat’s health, and consider being equipped with pet insurance to be more equipped to handle medical emergencies. The best pet insurance provides comprehensive health protection with little economic stress, which is why you must contemplate purchasing a policy.

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