How to Tell If Your Cat Is Sick: Early Signs Every Owner Should Know

1. Changes in Behavior and Energy

A noticeable change in your cat’s routine can be an early sign of discomfort. A cat that usually greets you may begin hiding, sleeping much more than usual, avoiding family members, or losing interest in favorite activities.

• Unusual hiding: Your cat repeatedly retreats to secluded places.
• Low energy: Your cat seems unusually weak, withdrawn, or reluctant to move.
• Unexpected aggression: A normally friendly cat hisses, growls, or reacts when touched.
• Restlessness: Your cat cannot settle, repeatedly changes position, or seems uncomfortable.
• Vocal changes: There is a sudden increase in crying, yowling, or other unusual sounds.

These signs can have many causes, including pain, stress, and illness. If the change is sudden, persistent, or accompanied by other symptoms, contact your veterinarian.

2. Eating or Drinking More or Less Than Usual

Appetite and thirst are useful everyday clues. Watch for a cat that refuses meals, eats much less, suddenly seems constantly hungry, drinks far more water, or begins drinking noticeably less.

A cat that stops eating should not simply be left to wait it out. Contact a veterinarian promptly if your cat refuses food, particularly if this approaches 24 hours or your cat has other symptoms. Kittens, senior cats, and cats with existing health problems may need attention sooner.

Do not force-feed or give human medication unless a veterinarian specifically instructs you to do so.

3. Litter-Box Habits That Suddenly Change

Changes in urination or bowel movements can signal a health problem. Check the litter box daily so you can notice differences in frequency, amount, consistency, or appearance.

• Urinating much more or less than usual.
• Straining, crying, or repeatedly entering the litter box.
• Blood in the urine or stool.
• Diarrhea, unusually hard stool, or persistent constipation.
• Urinating outside the litter box when this is not normal for your cat.

4. Changes in Coat, Eyes, Mouth, or Body

Your cat’s appearance can offer clues about its health. Look for changes from its usual condition rather than relying on one sign alone.

Coat and grooming

A coat that becomes greasy, matted, or unkempt—or a cat that suddenly stops grooming—may be experiencing pain or illness. Excessive licking can also lead to bald patches or irritated skin.

Eyes and nose

Persistent discharge, squinting, redness, cloudiness, or a closed eye should be checked by a veterinarian. Eye problems can worsen quickly, so do not delay when your cat appears painful or has a sudden eye change.

Mouth and gums

Bad breath, drooling, mouth bleeding, difficulty chewing, or pawing at the mouth can indicate dental or other problems. Pale, blue, grey, or yellow gums are especially concerning and warrant urgent veterinary assessment.

Weight, swelling, and movement

Noticeable weight changes, a swollen abdomen, limping, stiffness, or difficulty jumping may be signs of an underlying issue. Sudden inability to stand or walk needs emergency attention.

5. Vomiting, Diarrhea, Coughing, or Breathing Changes

An isolated episode of vomiting may occur for several reasons, but repeated vomiting, persistent diarrhea, blood, or symptoms combined with weakness or appetite loss need veterinary advice.

Pay particular attention to these signs:

• Repeated vomiting or inability to keep water down.
• Diarrhea that persists, contains blood, or occurs with marked weakness.
• Repeated coughing, wheezing, or unusual noisy breathing.
• Open-mouth breathing, gasping, or obvious effort to breathe.
• Sudden collapse, disorientation, or seizure activity.

6. When Should You Call a Veterinarian?

When in doubt, call a veterinary clinic and describe what you have observed. The clinic can help you decide how quickly your cat needs to be examined.

This is a general guide, not a complete triage list. A very young kitten, an older cat, or a cat with a known condition may need quicker assessment. If your cat is deteriorating or you are unsure, seek professional advice rather than waiting for a symptom to become severe.

7. A Simple Daily Cat Health Check

Use this checklist to notice changes over time. It does not replace veterinary examinations, vaccinations, parasite prevention, or other recommended care.

What to Tell Your Veterinarian

A few details can help your veterinarian assess the situation. Before calling, note when the symptoms began, whether they are getting worse, your cat’s eating and drinking habits, litter-box changes, possible exposure to plants or chemicals, and any medication your cat takes.

If it is safe to do so, a short video of unusual movement, coughing, or behavior may be useful. Never delay emergency care to collect information or record a video. Do not give human painkillers or other medicines unless your veterinarian directs you.