How to Tell If Your Cat Is Sick

10 Signs of Illness Every Cat Owner Should Know

Cats are masters at hiding illness. By the time your cat shows obvious symptoms, their condition may have already progressed. That’s why noticing small changes in behavior and routine is so important. If something feels “off,” it’s always okay to reach out to your veterinarian for guidance.

1. Changes in Interaction (Cat Acting Weird)

If your cat is acting weird, it can be one of the first signs something isn’t right.

· A normally affectionate cat becoming distant or hiding

· A usually independent cat suddenly becoming very clingy

· Increased aggression or irritability, especially when touched

If these behavior changes last more than a day or two, scheduling a quick exam can help rule out pain or illness.

2. Changes in Activity Level

Watch for noticeable shifts in your cat’s energy or daily habits.

· Sleeping much more than usual

· Restlessness or pacing

· A sudden change in playfulness or routine

When activity levels change without an obvious reason, your veterinarian can help determine whether it’s age-related or something medical.

3. Changes in Chewing or Eating Habits (Cat Not Eating)

If your cat is not eating, or suddenly eating much more than normal, it’s a reason to pay attention.

· Loss of appetite or refusing food

· Increased appetite

· Drooling, pawing at the mouth, or chewing on one side

A cat not eating for more than 24 hours should always be checked by a veterinarian.

4. Changes in Water Intake (Drinking Too Much Water)

If your cat is drinking too much water—or noticeably less than usual—it could be a sign of an underlying health issue.

Changes in water intake are often associated with kidney disease or diabetes. If you’re unsure what’s normal for your cat, your veterinary team can help you track and evaluate these changes.

5. Unexpected Weight Loss or Weight Gain

Weight changes don’t always match appetite.

Some cats lose weight despite eating more, which can happen with conditions like hyperthyroidism or diabetes. Routine wellness exams and regular weigh-ins can help catch these changes early.

6. Bad Breath

Persistent bad breath is more than just unpleasant.

It may be a sign of dental disease, infection, digestive issues, or kidney disease. A dental exam is an easy way to identify problems before they become painful or serious.

7. Changes in Grooming Habits (Cat Not Grooming)

If your cat is not grooming like they used to, it may indicate discomfort or illness.

· A greasy or unkempt coat

· Fur matting

· Over-grooming that causes bald spots

If grooming changes don’t improve, a veterinary visit can help identify whether pain, skin disease, or stress is involved.

8. Changes in Sleeping Habits

Illness can affect how and where your cat sleeps.

· Sleeping much more than usual

· Increased nighttime activity or yowling

· Restlessness or sleeping in unusual places

If sleep changes are paired with other symptoms, it’s a good idea to have your cat examined.

9. Changes in Vocalization

A change in how often—or how—your cat vocalizes can be meaningful.

· Sudden yowling, especially at night

· A quiet cat becoming very vocal, or the opposite

· Changes in tone or sound of meows

These changes may be linked to medical conditions, and your veterinarian can help determine the cause.

10. Changes in Litter Box Habits (Cats Peeing Outside the Cat Box)

If you notice cats peeing outside the cat box, it’s often a sign something isn’t right.

· Accidents outside the litter box

· Changes in stool consistency

· Straining or frequent small amounts of urine

· Large volumes of urine at one time

⚠️ If you are unsure whether your cat is urinating at all, this is an emergency and your cat should be seen by a veterinarian immediately.

When in Doubt, Check It Out

You know your cat better than anyone. If you’re ever unsure whether a change is serious, a quick call or visit to your veterinarian can provide peace of mind—and early care can make a big difference.

If you notice one or more of these signs, don’t hesitate to reach out to your veterinary team. We’re here to help keep your cat healthy, comfortable, and feeling their best. 🐾