Cats are evolutionary masters of disguise when it comes to pain. In the wild, showing weakness makes an animal a target for predators. This survival instinct means that by the time a cat is visibly sick, the problem has often been developing for weeks or even months.

Learning to read the subtle signs can help you catch problems much earlier. Here are eight body language cues that may indicate your cat is in pain or unwell.

1. The Squinty Eyes

A healthy, relaxed cat has open, bright eyes. A cat in pain often squints or partially closes their eyes, even when awake and alert. This is different from the slow blink (which is a sign of affection). Pain squinting is persistent and often accompanied by a tense facial expression.

Researchers have developed the Feline Grimace Scale, a validated tool for assessing pain based on facial expressions. The five key facial features to watch are ear position, orbital tightening (squinting), muzzle tension, whisker position, and head position.

2. Changes in Sleeping Position

Most cats have preferred sleeping positions. A cat that suddenly changes how they sleep may be trying to avoid pressure on a painful area. Cats with abdominal pain often sleep in a hunched, tucked position. Cats with joint pain may stop sleeping in elevated spots they used to love.

If your cat has always curled up on the back of the couch but now only sleeps on the floor, that shift is worth noting.

3. Altered Grooming Habits

Cats are fastidious groomers. Two changes are red flags:

Over-grooming: Excessive licking or chewing at one area can indicate pain, skin irritation, or stress. Cats with urinary pain often over-groom their lower belly. Cats with joint pain may lick the affected area until it is bald.

Under-grooming: A cat that stops grooming, developing a matted or greasy coat, is often not feeling well. This is especially significant in cats that were previously meticulous about their appearance. Dental pain, arthritis, and general malaise are common causes.

4. Hiding More Than Usual

All cats enjoy some alone time. But a sudden increase in hiding behavior, especially in a cat that is normally social, is one of the most reliable indicators of illness. Cats instinctively seek isolated, enclosed spaces when they feel vulnerable.

If your cat has disappeared under the bed and does not come out for meals or when called, something is likely wrong.

5. Changes in Litter Box Habits

The litter box is one of the most important health monitoring tools a cat owner has. Watch for:

Going more or less frequently than usual
Straining to urinate (this is an emergency in male cats)
Blood in urine or stool
Urinating outside the litter box (often a sign of pain association with the box itself)
Changes in stool consistency

Urinary blockages in male cats can become life-threatening within 24 to 48 hours. If your male cat is making frequent trips to the litter box with little to no output, seek emergency veterinary care immediately.

6. Vocalization Changes

A cat that suddenly becomes more vocal may be in pain. Yowling, especially at night, is common in cats with hyperthyroidism, high blood pressure, or cognitive dysfunction. Growling or hissing when touched in a specific area suggests localized pain.

Conversely, a normally talkative cat that goes quiet may also be unwell. Any significant change from baseline behavior is the key signal.

7. Changes in How They Move

Subtle mobility changes are easy to miss, especially in indoor cats. Watch for:

Hesitating before jumping up or down
Taking stairs one at a time instead of bounding
Sitting differently (shifting weight to one side)
Reluctance to be picked up
Walking with a stiffer gait than usual

Arthritis affects an estimated 90% of cats over age 12, yet it is dramatically underdiagnosed because cats compensate so well. They simply stop jumping rather than limping, so the change often looks like "slowing down with age" rather than pain.

8. Appetite and Water Intake Shifts

A cat that suddenly eats less or drops food from their mouth may have dental pain, which affects the majority of cats over age three. A cat that suddenly drinks more water should be evaluated for kidney disease, diabetes, or hyperthyroidism, all common in older cats.

Watch for the head tilt. Cats with dental pain sometimes tilt their head to one side while chewing, favoring the less painful side of their mouth.

Tracking Makes the Invisible Visible

The challenge with subtle signs is that they are easy to dismiss individually. "She is just getting older." "He is always been a little moody." But when you track these observations consistently, patterns emerge.

PetAgents helps cat owners log daily observations and automatically correlates them with health markers. The platform's AI agents can detect when a combination of subtle changes, reduced appetite plus increased hiding plus decreased jumping, suggests that a vet visit is warranted, even when no single symptom seems alarming on its own.

Trust Your Instincts

You know your cat better than anyone. If something feels off, even if you cannot pinpoint exactly what has changed, that gut feeling is worth acting on. Early detection consistently leads to better outcomes, lower costs, and less suffering.

A simple wellness check gives you peace of mind and gives your vet the chance to catch what your cat is working so hard to hide.

Understanding Your Cat's Body Language: 8 Signs of Pain or Illness