Cat Health Problems: Common Ailments & Symptoms
Know the signs, understand the causes, and learn when to act. Early detection saves lives.
Most serious cat illnesses are easier to treat when caught early — so the key skill for an owner is noticing change. Any sudden shift in your cat's eating, drinking, litter box habits, weight, grooming, or energy is worth a vet call.
This page outlines common feline ailments by severity and lists the emergency signs that mean you should not wait. It is educational only and never replaces a diagnosis from a licensed veterinarian.
Important: This information is for educational purposes only. Always consult a licensed veterinarian for diagnosis and treatment. When in doubt — call your vet.
🚨 Emergency Signs — Go to the Vet Immediately
- • Difficulty breathing or open-mouth breathing
- • Straining to urinate (especially male cats)
- • Collapse or sudden inability to walk
- • Suspected poisoning or toxin ingestion
- • Seizures or uncontrolled tremors
- • Eye injury or sudden vision loss
- • Severe bleeding that won't stop
- • Unconsciousness or unresponsiveness
- • Body temperature below 37°C or above 40°C
How to tell when a symptom is serious
Cats evolved to mask weakness, so they rarely show illness clearly. Rather than waiting for an obvious sign, owners and vets watch for change from the cat's normal baseline. The practical method is:
- Know the baseline — your cat's usual appetite, water intake, litter output, weight, and activity.
- Notice deviation — eating or drinking noticeably more or less, hiding, litter box changes, or weight loss over weeks.
- Judge urgency — gradual changes warrant a routine vet appointment; the emergency signs above warrant immediate care.
Severity on this page is a guide to typical urgency, not a diagnosis. A "mild" condition can still be serious for an individual cat, which is why a vet visit is the safe default whenever you are unsure.
Worked example: spotting kidney disease early
A real-world pattern
Milo is a 12-year-old cat. Over about three weeks his owner notices the water bowl emptying faster and two extra wet patches in the litter tray each day. Milo's appetite is slightly down and he has lost roughly 200 g.
Individually each change is small. Together — increased thirst, increased urination, mild weight loss, and reduced appetite — they form a classic early pattern of chronic kidney disease, one of the most common conditions in older cats.
Because the owner knew Milo's baseline, the vet ran blood and urine tests early. Caught at this stage, kidney disease is managed with diet and monitoring for years — far better than waiting until the cat is visibly unwell.
Frequently asked questions about cat health
When should I take my cat to the vet?
See a vet promptly for any sudden change in eating, drinking, litter box habits, energy, or weight. Go immediately for difficulty breathing, straining to urinate, collapse, seizures, suspected poisoning, or uncontrolled bleeding.
What are the most common health problems in cats?
Common feline health issues include dental disease, obesity, chronic kidney disease, hyperthyroidism, urinary tract problems, fleas and worms, and upper respiratory infections. Many are manageable when caught early.
Why is my cat straining to use the litter box?
Straining to urinate can signal a urinary blockage, which is a life-threatening emergency, especially in male cats. If your cat is straining and producing little or no urine, contact a vet or emergency clinic immediately.
How do I know if my cat is in pain?
Cats hide pain well. Watch for hiding, reduced grooming, changes in posture, reluctance to jump, loss of appetite, litter box avoidance, or unusual aggression. Any of these warrants a vet check.
How often should a cat have a health check?
Healthy adult cats should see a vet once a year, and senior cats aged seven and over every six months, because early disease detection greatly improves outcomes.