How to Detect Illness in Your Cat: Signs Every Owner Should Know

Key Takeaways

Learn to recognize the early warning signs of illness in your cat. Early detection can save lives and reduce suffering for your feline companion.

Is your cat acting a bit off? Being able to tell when your feline friend is under the weather is crucial for their well-being. Early detection of illness can mean the difference between a simple treatment and a serious health crisis.

Why Cats Hide Illness

Cats are masters at masking pain and illness—it's an instinct from their wild ancestors who needed to hide vulnerability from predators. This makes it especially important for owners to recognize subtle changes.

Physical Warning Signs

▸Changes in Appetite

Decreased Appetite

Refusing favorite foods

Eating significantly less than usual

Walking away from food bowl

Weight loss

Increased Appetite

Constantly hungry despite eating

Weight loss despite eating more (possible hyperthyroidism)

Eating non-food items (pica)

▸Changes in Drinking

Drinking More

Empty water bowls more frequently

Drinking from unusual sources

Possible signs of diabetes or kidney disease

Drinking Less

Concentrated urine

Lethargy

Potential dehydration

▸Litter Box Changes

Urination Issues

Urinating outside the box

Straining to urinate

Blood in urine

Crying while urinating

Frequent trips to litter box

These can indicate urinary tract infections, bladder stones, or blockages—especially serious in male cats.

Defecation Issues

Diarrhea lasting more than a day

Constipation

Blood in stool

Straining to defecate

Changes in frequency

▸Respiratory Signs

Coughing (rare in healthy cats)

Wheezing or labored breathing

Open-mouth breathing (EMERGENCY)

Discharge from nose

Sneezing fits

▸Physical Appearance

Coat Changes

Dull, unkempt fur

Excessive shedding

Bald patches

Dandruff increase

Eye Changes

Discharge or crustiness

Redness or swelling

Cloudiness

Third eyelid visible

Other Physical Signs

Lumps or bumps

Wounds that don't heal

Unusual odors

Weight changes

Behavioral Warning Signs

▸Activity Level Changes

Sleeping more than usual

Reluctance to play

Moving slowly

Staying in one place

Restlessness

Pacing

Unable to get comfortable

Unusual vocalization

Acting confused

▸Social Changes

Hiding more than usual

Avoiding family members

Increased aggression

Unusual clinginess

Not greeting you as usual

▸Grooming Changes

Over-grooming

Bald spots from excessive licking

Red, irritated skin

Focus on one area

Could indicate pain or stress

Under-grooming

Matted fur

Dirty appearance

Especially in previously fastidious cats

Often indicates feeling unwell

Pain Indicators

Cats are subtle about pain. Watch for:

Reluctance to jump

Difficulty climbing stairs

Hunched posture

Protecting certain body parts

Aggression when touched

Changes in facial expression

When to Seek Emergency Care

▸GO TO THE VET IMMEDIATELY IF:

Open-mouth breathing or severe respiratory distress

Unable to urinate (especially male cats)

Seizures

Collapse or unconsciousness

Severe bleeding

Ingestion of toxins

Severe trauma

Paralysis of back legs

Bloated, hard abdomen

▸See the Vet Soon If:

Not eating for more than 24 hours

Vomiting or diarrhea lasting more than a day

Difficulty urinating or defecating

Visible injury or wounds

Sudden behavior changes

Rapid weight loss or gain

Monitoring Your Cat's Health

▸Regular Observations

Make it a habit to:

Check eating and drinking daily

Monitor litter box output

Observe activity levels

Feel for lumps during petting

Note any behavior changes

▸Keep a Health Journal

Track:

Weight (monthly)

Food consumption

Litter box habits

Behavior changes

Any symptoms noticed

▸Regular Vet Visits

Schedule:

Annual check-ups for adult cats

Twice yearly for seniors (7+ years)

Immediate visits for concerning symptoms

Home Health Checks

▸Monthly Checks

Feel for lumps or bumps

Check ears for odor or discharge

Look at eyes for clarity

Examine mouth for red gums or bad breath

Feel along spine and ribs for weight changes

▸After Play Sessions

These are good times to do casual health checks while your cat is relaxed and trusting.

Conclusion

Knowing the signs of illness in cats can save lives. Trust your instincts—you know your cat best. If something seems off, it's always better to check with your veterinarian than to wait and see.

At Designer Cats Singapore, we provide health guidance and support to all our kitten buyers. Contact us at 6242 4216 or WhatsApp 9619 1577 for more information!

Continue Your Learning

Explore these related guides for more helpful information:

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Continue in the Cat Health guide

This article is one chapter of a larger Singapore guide. The hub links every related chapter in reading order.

Cat vaccination guideCore vaccines and the schedule from kitten to adult.

Sterilisation: spay and neuterTiming, recovery and behavioural effects.

Cat dental carePreventing the dental disease most indoor cats develop.

Weight managementBody condition scoring and safe weight loss.

Common cat health problemsThe conditions Singapore vets see most often.

Supporting immunityDiet, stress and routine factors that affect resilience.

References & Authoritative Sources

Our editorial team reviews authoritative veterinary and registry sources for every guide. Reviewed by our consulting veterinarian.

Animal & Veterinary Service (AVS), Singapore — Pet licensing & welfare standards

WSAVA Vaccination Guidelines — Global feline vaccination protocol

AAFP Feline Life Stage Guidelines — Veterinary care across life stages

Cat Fanciers' Association (CFA) — Breed standards & registry

The International Cat Association (TICA) — Breed standards & registry

FIFe — Fédération Internationale Féline — International breed standards

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Last updated: 26 August 2026