How Do I Know If My Cat Is Sick?
It Started With Rebel…
One day, Rebel wasn’t acting like herself.
Normally, she’s the self-appointed supervisor of everything I do.
Laundry? She’s there.
Making dinner? She’s in the kitchen.
Walking to another room? I have an escort.
But that day…
She spent almost the entire day sleeping under a blanket.
At first, I didn’t think much of it. Cats sleep a lot, right?
When she finally came out, something still didn’t seem right.
She seemed a little unsteady on her feet.
Her pupils looked larger than normal.
For a moment, she even seemed confused.
I’ll be honest…
It scared me.
After she ate a little and got some more rest, she gradually returned to normal.
Thankfully, she was okay.
But the whole experience reminded me just how difficult it can be to tell the difference between a cat simply having an “off day” and a cat that’s actually sick.
That left me wondering…
How do you know when your cat is sick?

Cats Are Experts at Hiding Illness
Unlike people, cats rarely make it obvious when they don’t feel well.
In the wild, showing weakness could make them vulnerable to predators. Even though our house cats live much safer lives, they still have that instinct to hide discomfort.
That’s why even small changes in behavior can sometimes be important.
Common Signs Your Cat May Be Sick
While every cat is different, these are some of the most common signs that something may not be right.
🍽️ They’re Not Eating or Drinking
A missed meal isn’t always an emergency.
If your cat refuses food, isn’t drinking normally, or you notice a significant change in eating or drinking, contact your veterinarian for guidance.
🛏️ They’re Hiding More Than Usual
Some cats enjoy quiet places.
But if your normally social cat suddenly disappears under the bed or avoids everyone, they may not be feeling well.
🤢 Vomiting or Diarrhea
An occasional hairball isn’t unusual.
Repeated vomiting, diarrhea, or blood should always be taken seriously.
😴 They’re Sleeping Much More Than Normal
Cats already sleep a lot.
But if your cat is unusually difficult to wake, seems weak, or has no interest in normal activities, it may be time to investigate.
🚶 Trouble Walking or Acting Disoriented
Stumbling…
Walking differently…
Difficulty jumping…
Or seeming confused…
These changes should never be ignored.
💧 Drinking Much More (or Much Less)
Changes in water intake can sometimes be one of the earliest signs that something is wrong.
Pay attention if your cat suddenly empties the water bowl—or barely touches it.
🚽 Changes in Litter Box Habits
A change in your cat’s litter-box habits can be an important clue that something isn’t right.
Watch for things like:
- urinating more or less than usual
- repeated trips to the litter box
- straining to urinate or defecate
- diarrhea
- constipation
- suddenly going outside the litter box
If your cat is straining to urinate or producing little or no urine, contact a veterinarian immediately.
That last point is particularly important because urinary obstruction can be an emergency.
⚖️ Weight Changes
Gradual weight loss often goes unnoticed because we see our cats every day.
Feeling your cat’s body condition regularly can help you notice changes before they become serious.
When Should You Call Your Veterinarian?
Some situations can be monitored for a short time.
Others shouldn’t wait.
It’s a good idea to contact your veterinarian if your cat:
- refuses food for more than 24 hours
- has repeated vomiting or diarrhea
- struggles to breathe
- cannot stand or walk normally
- appears to be in pain
- has a seizure
- suddenly becomes extremely lethargic
- has any behavior that feels dramatically different from normal
Some of these signs—especially difficulty breathing, seizures, collapse, or an inability to stand or walk normally—may require emergency veterinary care.
When you’re unsure, it’s always okay to call your veterinary clinic and ask for guidance.
What Can You Do at Home?
While waiting for veterinary advice, you can:
- Make sure fresh water is available.
- Encourage your cat to rest in a quiet, comfortable place.
- Monitor eating, drinking, and litter box habits.
- Watch for changes instead of assuming they’ll pass on their own.
The more information you can give your veterinarian, the easier it is to determine what may be going on.
What I’ve Learned From Rebel
Living with Rebel has taught me something I never expected.
No one knows your cat better than you do.
You learn their routines.
Their favorite sleeping spots.
How they greet you.
How much they normally eat.
How much mischief they usually get into.
So when something feels different…
It probably is.
Most of the time, it turns out to be nothing serious.
But I’d rather make one unnecessary phone call than ignore something important.
Sometimes paying attention is one of the best ways we can care for the cats who depend on us.
❤️
🐾 Rebel Says…
“If I stop causing trouble… you should probably check on me.”
🐾 Continue the Adventure
Rebel has plenty more stories to tell…
Whether she’s following me from room to room, testing gravity one object at a time, or getting into a little harmless mischief, there’s always another adventure waiting.
Where will Rebel take you next?
💤Why Is My Cat Sleeping So Much?
🙈Why Is My Cat Hiding?
📚 Explore Cat Health
🐾 Explore Cat Care
🐱 Explore Cat Behavior
📖 Explore Cat Stories
Want to Meet Rebel?
“If you’re wondering how Rebel became my tiny shadow in the first place…”