Early Signs Your Cat Is Unwell: 12 Subtle Red Flags

Cats are good at hiding discomfort. That’s normal survival behaviour—but it also means the early warning signs can look small and easy to miss. The best approach is to watch for changes from your cat’s personal “normal.”

Here are subtle signs your cat might be unwell, plus when to take it seriously.

The rule: change matters more than “one symptom”

One weird day isn’t always a crisis. But a clear change in behaviour, appetite, litter habits, or posture is worth paying attention to—especially if it lasts more than 24–48 hours.

12 early signs your cat might be unwell

1) Eating less (or eating differently)

Even small appetite changes can matter, especially if your cat normally eats consistently.

2) Drinking more or less than usual

Noticeable changes in water intake can be an early clue for multiple issues.

3) Litter box changes

Straining, going more often, going outside the box, blood, diarrhoea, constipation, or sudden accidents are all red flags.

4) Grooming changes

Over-grooming, not grooming, greasy coat, dandruff, or mats forming can signal discomfort, stress, or illness.

5) Hiding more than usual

Cats often hide when they feel unwell. If your cat suddenly becomes “invisible,” pay attention.

6) Sleeping far more (or seeming unusually restless)

A tired cat isn’t automatically sick, but a sudden change in sleep pattern can be a clue.

7) Behaviour changes (clingy, distant, irritable)

A sudden personality shift matters. Some cats become unusually clingy; others withdraw.

If your cat suddenly starts hovering or watching you at night, that can sometimes be part of a behaviour change pattern.

8) Changes in movement

Jumping less, stiffness, limping, avoiding stairs, or moving more cautiously can indicate pain (especially joints).

9) Vocalising more (or in a different way)

New night meowing, yowling, or “complaint” noises can sometimes be discomfort, stress, or routine change.

10) Bad breath or mouth discomfort

Drooling, pawing at the mouth, chewing on one side, or refusing hard food can suggest dental pain.

11) Breathing changes

Open-mouth breathing, persistent panting, wheezing, or rapid breathing at rest should be taken seriously.

12) Eyes and nose changes

Discharge, squinting, redness, frequent sneezing, or a “not quite right” face can indicate infection or irritation.

When to call a vet (don’t wait)

Get advice promptly if you see: difficulty breathing, repeated vomiting, blood in urine/stool, straining in the litter box, collapse, severe lethargy, refusal to eat for a full day, or anything that looks like significant pain.

A simple cat-parent link (kept light)

Being a cat parent means noticing the small stuff. If you like clean, minimal cat staples, the Signature T-Shirt is an easy everyday option. If you want a cosy layer, the Eclipse Sweatshirt works well. Browse Sweatshirts or head back to the homepage.

💭 Final Thoughts

Cats don’t always show pain clearly. If you notice changes in appetite, litter habits, grooming, posture, energy, or behaviour, take it seriously—especially if it lasts more than a day or two. When in doubt, it’s better to check early than to wait for obvious symptoms.