6 Signs That Your Cat Is Sick

By cutenessiscats • Updated: September 8, 2025 • Read time: ~15 minutes

Cats are known for being independent and often hiding signs of discomfort. Because of this, it can be difficult to tell when your cat isn’t feeling well. Understanding the subtle signals of illness can help you take action early and possibly save your cat’s life. In this guide, we’ll explore six major signs that indicate your cat might be sick, what they could mean, and what steps you should take to ensure your furry friend stays healthy.

1. Changes in Appetite

If your cat suddenly eats much less—or much more—than usual, it may be a sign of illness. Loss of appetite can indicate dental disease, gastrointestinal issues, or more serious conditions like kidney failure or cancer. On the other hand, increased hunger could point to problems like diabetes or hyperthyroidism.

🚩 Tip: Track your cat’s eating habits daily. Even small changes in appetite can be meaningful.

2. Unexplained Weight Loss or Gain

Weight changes are often overlooked but can be an important indicator of health problems. Gradual or sudden weight loss might signal metabolic disorders, parasites, or chronic illness. Weight gain, especially in indoor cats, can lead to obesity-related conditions like arthritis or diabetes.

🚩 Tip: Weigh your cat regularly using a pet scale or by weighing yourself while holding your cat. Keep a log for your vet.

3. Lethargy or Reduced Activity

Cats love their naps, but if your usually playful kitty is suddenly listless, uninterested in toys, or hiding more than usual, it could mean they’re unwell. Lethargy may be linked to infections, heart disease, or pain from injuries.

🚩 Tip: Compare your cat’s current behavior to their normal patterns rather than other cats. Every cat has a unique energy level.

4. Changes in Grooming Habits

Cats are naturally clean animals that spend a large portion of their day grooming. If your cat stops grooming, develops a greasy or matted coat, or excessively licks certain areas, this may be a sign of illness. It could indicate dental pain, arthritis, skin conditions, or stress-related issues.

🚩 Tip: Check your cat’s coat weekly for mats, bald patches, or skin irritation.

5. Breathing Difficulties or Coughing

Respiratory problems in cats are serious and require immediate veterinary attention. Wheezing, rapid breathing, coughing, or labored breaths may indicate asthma, heart disease, or lung infections.

🚩 Tip: Count your cat’s breaths while they’re resting. More than 30 breaths per minute at rest can signal a problem.

6. Changes in Litter Box Habits

Alterations in urination or defecation patterns can be red flags. Straining to urinate, blood in the litter, or frequent trips without results could point to urinary tract infections or blockages, which can be life-threatening if untreated. Diarrhea or constipation may also indicate dietary issues or illness.

🚩 Tip: Scoop your cat’s litter box daily so you can monitor changes in stool or urine easily.

Other Warning Signs

While these six are the most common, there are additional symptoms you should not ignore:

• Persistent vomiting
• Bad breath or drooling
• Excessive scratching or skin irritation
• Sudden aggression or behavior changes

When to See the Vet

If you notice any of these signs, don’t wait for them to go away on their own. Cats often deteriorate quickly once symptoms appear. Contact your veterinarian immediately for guidance and possible diagnostic tests.

Frequently Asked Questions (FAQ)

How can I tell if my cat is in pain?

Look for subtle changes like hiding, decreased activity, reluctance to jump, or changes in grooming habits. Cats rarely vocalize pain like dogs do.

Should I take my cat to the vet if they vomit once?

Occasional vomiting may not be serious, but frequent or persistent vomiting should always be checked by a vet.

What are emergency warning signs in cats?

Difficulty breathing, inability to urinate, seizures, or sudden collapse are emergencies—seek veterinary care immediately.

Can stress make my cat sick?

Yes. Stress can weaken the immune system, trigger urinary issues, and lead to behavioral changes that mask underlying illness.

Final Thoughts

Cats are masters at hiding illness, which makes it crucial for owners to recognize even subtle changes in behavior, appetite, or appearance. By watching for these six major signs, you can act quickly and give your cat the medical attention they need. Early detection often leads to better outcomes, helping your feline friend live a longer, healthier, and happier life.

Written by cutenessiscats