How to Tell If Your Cat Is in Pain — The Subtle Signs Most Owners Miss

Nearly 40% of cat owners don’t recognise pain in their pets until it’s severe. Yet a 2025 study from the Royal Veterinary College found that cats mask discomfort so effectively that subtle behavioural changes are often dismissed as ‘just being moody’. In this article you’ll discover the seven warning signs vets wish owners would catch earlier—and how to spot the difference between a grumpy day and genuine suffering. Most importantly, you’ll learn why your cat’s litter box habits might be the single biggest clue you’re missing.

1. Changes in Litter Box Behaviour—Your First Warning Sign

If your cat suddenly avoids the litter box, urinates outside it, or strains noticeably, pain is often the culprit. Cats with arthritis or urinary issues find it agonising to squat or jump into a high-sided tray.

Watch for: frequent visits with little output, positioning changes (standing rather than squatting), or reluctance to enter the room where the box sits. This is one of the earliest pain signals vets see.

2. Reduced Grooming or Matted Patches

A cat in pain stops grooming thoroughly because movement hurts. You’ll notice matted fur on the back, sides, or rear legs—areas they’d normally lick daily.

Conversely, some cats over-groom one spot obsessively, targeting the exact site of pain. Luna, a 9-year-old tabby from Manchester, began licking her left hip raw; her owner assumed stress until X-rays revealed severe arthritis.

3. Reluctance to Jump or Climb—But Not Always Obvious

Many owners expect dramatic lamping, but cats are subtler. Instead of limping, they’ll pause before jumping, land awkwardly, or avoid favourite high spots altogether.

Your cat might use furniture as stepping stones instead of jumping directly to the sofa, or refuse to climb stairs at all. These small adjustments are how cats cope—and why pain goes undetected.

4. Behavioural Shifts—Aggression, Hiding, or Withdrawn Affection

Pain makes cats irritable and withdrawn. A typically friendly cat becomes snappy when touched near the painful area, or hides for days without emerging. Some become unusually vocal—yowling or crying out.

The key: these changes are *new* for your individual cat. A naturally shy cat hiding isn’t concerning; an outgoing cat suddenly becoming reclusive is.

5. Loss of Appetite or Picky Eating

Cats in pain lose interest in food because movement to the bowl or chewing requires effort. Weight loss over 3–4 weeks is a red flag, even if your cat still eats small amounts.

Some cats develop texture preferences—avoiding hard kibble in favour of wet food because chewing hurts their jaw or neck.

6. Pupils Dilated, Ears Flattened, or Tense Jaw

Watch your cat’s face closely. Chronic pain causes permanently dilated pupils, ears rotated backward, and a clenched jaw. These are subtle but consistent in cats experiencing ongoing discomfort.

7. Sleeping More (But Restlessly)

Cats sleep 12–16 hours normally, but pain increases this as their body attempts healing. The difference: a painful cat doesn’t sleep *peacefully*. Watch for twitching, frequent position changes, or waking suddenly as if startled.

The Bottom Line: Trust Your Gut

You know your cat better than anyone. If you notice *any* cluster of these signs—especially litter box changes plus reduced jumping plus behavioural shifts—book a vet check within a week. Early pain management transforms quality of life, and cats respond brilliantly to treatment once diagnosed.

Have you noticed your cat avoiding the litter box or skipping their favourite perch? That could be the moment everything changes. Don’t wait—contact your vet this week with a diary of what you’ve observed. Your cat can’t tell you they’re hurting; these subtle signs are their voice.