Why Cats Hide Signs of Illness

Cats are famously self-contained creatures — and that instinct extends to illness. In the wild, showing vulnerability invites danger, so cats have evolved to mask pain and discomfort remarkably well. This means that by the time a symptom becomes obvious, a health issue may already be progressing. As an owner, your most valuable tool is knowing your individual cat's normal baseline and recognising when something shifts.

The checklist below is designed to help you spot those shifts early. Some items point to conditions that need same-day or emergency care; others suggest a call to your vet within a day or two is wise. Use it regularly — not just when something seems wrong. For a broader look at what typical feline behaviour actually looks like, see why cats do the strange things they do.

Eating and Drinking Changes

Contact your vet if your cat refuses food for more than 24–48 hours, as prolonged anorexia in cats can quickly lead to a serious liver condition called hepatic lipidosis. Must
Note any dramatic increase in appetite, especially in older cats, which can signal hyperthyroidism or diabetes. Should
Watch for a sudden increase in water consumption paired with increased urination — these are classic signs of kidney disease or diabetes. Must
Track whether your cat is losing or gaining weight without a clear dietary reason. Should

Litter Box Behaviour

Seek emergency care immediately if a male cat is straining to urinate or producing no urine at all — urinary blockages are life-threatening. Must
Call your vet promptly if your cat is crying out while using the litter box or visiting it far more frequently than usual. Must
Report blood in the urine or stool to your veterinarian without delay. Must
Monitor for diarrhoea lasting more than 24 hours or vomiting that occurs more than twice in a single day. Should

Grooming and Physical Appearance

Schedule a vet visit if your cat has stopped grooming and the coat has become dull, matted, or unkempt — this often indicates pain or systemic illness. Should
Check for new lumps, bumps, or swelling anywhere on the body and have them evaluated promptly. Should
Watch for excessive scratching, hair loss, or skin sores that could indicate allergies, parasites, or infection. Should
Look for pale, white, blue, or yellow-tinged gums, which can signal serious cardiovascular, respiratory, or liver problems. Must

Behaviour and Mobility

Seek immediate care if your cat is having difficulty breathing, breathing with its mouth open, or its sides are heaving noticeably. Must
Contact your vet if your cat is suddenly hiding more than usual, especially combined with any other symptom on this list. Should
Watch for limping, reluctance to jump, or signs of stiffness that persist beyond a day. Should
Report any episode of disorientation, sudden loss of balance, seizure-like activity, or head tilting to your vet right away. Must
Take note of unusual vocalisation — especially if your cat is suddenly vocal when picked up or touched in a specific area. Should
Consider a vet call if your normally social cat becomes persistently withdrawn, or a reserved cat becomes unusually clingy. Nice to have

Tools to Help You Monitor Your Cat's Health

You don't need a medical degree to keep a close eye on your cat — just a few simple habits and tools. Consistent observation at home, combined with regular scheduled vet visits, forms the backbone of responsible cat care. If you're weighing the full scope of what that care costs, our guide to the real costs of owning a cat offers a practical breakdown.

Required

Digital kitchen scale

Weigh your cat every few weeks at home to catch gradual weight loss or gain before it becomes significant.

Required

Pet health journal or notebook

Log observations about eating, drinking, litter box use, and behaviour to share accurate information with your vet.

Optional

Rectal or ear thermometer (pet-specific)

Take your cat's temperature if you suspect fever; normal feline temperature ranges from approximately 100.5°F to 102.5°F.

Optional

Veterinary telehealth or nurse hotline

Use a vet telehealth service to quickly consult a professional when you are unsure whether a symptom warrants an immediate visit.

Don't Wait to See If It Resolves on Its Own

A common instinct is to "give it a day" before calling the vet. For some mild symptoms this may be reasonable, but for the "must" items in this checklist — especially urinary blockage, breathing difficulties, or pale gums — waiting can be dangerous. When in doubt, call your veterinary clinic or an emergency animal hospital and describe what you're seeing. They can help you triage the situation.

When Age Changes the Equation

A symptom that warrants a watchful wait in a healthy five-year-old cat may require immediate attention in a kitten or a senior. Older cats are more susceptible to conditions like hyperthyroidism, kidney disease, and diabetes — many of which present with the same subtle signs covered in this checklist. Kittens, on the other hand, can deteriorate quickly because they have fewer reserves. Understanding how your cat's needs evolve over time is key — our article on how cats age walks through what to expect at each stage.

Male Cats and Urinary Blockages Are an Emergency

A male cat that is straining at the litter box and producing little or no urine may have a urethral blockage — a condition that can become fatal within 24 to 48 hours without treatment. Do not wait for a regular appointment. Go directly to an emergency veterinary clinic if your regular vet cannot see your cat immediately. This is one situation where acting fast genuinely saves lives.

This article is intended as general educational information and is not a substitute for professional veterinary advice, diagnosis, or treatment. Always consult a licensed veterinarian for guidance specific to your cat's health.