Why is my cat not eating?
First, separate two things. Some cats are famously finicky and skipping a meal or two isn't unusual for them (PetMD). But a cat who normally cleans the bowl and suddenly stops is telling you something — and PetMD is explicit that this change is often the first visible sign of illness, because cats hide problems until disease is advanced.
So the honest answer to "why is my cat not eating" is: it could be the food, the bowl, stress — or it could be her body. That's why the timing matters more than the cause you guess.
The most common medical causes
- Upper respiratory infection — a stuffy nose dulls smell, and smell drives appetite (PetMD/Grota).
- Dental disease — mouth pain stops cats mid-meal; watch for bad breath, drooling, bleeding gums.
- Gastrointestinal trouble — obstruction, pancreatitis, inflammatory bowel disease, constipation, or plain nausea (interested, then refuses).
- Organ disease — kidney disease is the classic; cancer, urinary tract disease and arthritis all make eating hurt or feel pointless (PetMD/Cohan).
- Congestive heart failure — coughing, fatigue and labored breathing make meals unappealing (PetMD/Grota).
Reasons that aren't medical
PetMD lists the everyday culprits too: a move, a new baby or pet, construction noise, moved food bowls, conflict with another animal, even new smells in the house. Cats are creatures of routine, and stress genuinely shuts appetite down.
There's also food aversion: a cat who felt sick (or was hospitalized) while eating a particular food may refuse that exact food forever after. If your cat's appetite dropped during a recent illness, the food is a suspect — not the cause.
How long can a cat safely go without eating?
PetMD draws the line firmly: if your cat fails to eat for 24–36 hours — even while drinking normally — it's time for a veterinary exam. Don't wait because she seems fine otherwise.
The danger is fatty liver. When a cat stops eating, her body mobilizes fat stores, and in cats that fat infiltrates the liver and can cause liver failure — hepatic lipidosis, especially dangerous in overweight cats. Meanwhile vomiting or diarrhea can dehydrate her fast, and dehydration is its own emergency.
Go in now if you see: visible weight loss, sunken eyes, yellowing (jaundiced) eyes, weakness or depression (PetMD/Cohan).
Getting a finicky cat to eat at home
- Warm the food — warm food smells stronger, and smell is appetite (PetMD).
- Switch flavor or texture — pâté vs. minced, or a new kibble shape; a tiny taste of a strong-smelling food on the tongue can restart a stalled appetite.
- Feed small and often — cats naturally prefer several small meals through the day.
- Move the bowl — quiet, low-traffic spot, away from the litter box and other pets.
These buy time; they don't replace the vet. If the tricks don't work within a day, or anything else looks off, book the appointment — the longer malnutrition runs, the longer the recovery (PetMD).
Frequently asked questions
My cat is not eating but acting normal — is that OK?
Maybe, if she's a known picker and it's brief. But PetMD warns cats hide illness until it's advanced, so if a normally eager eater skips 24–36 hours, treat it as a vet visit even if her mood seems unchanged.
Why is my cat not eating but drinking water?
Drinking while refusing food fits several PetMD-listed causes — kidney disease, diabetes, nausea, mouth pain — and doesn't make it safer. The 24–36 hour no-food rule applies regardless of water intake.
My cat stopped eating after the vet or a move. What now?
Stress and food aversion are common after hospital stays, moves, and household changes (PetMD). Offer a different flavor of the usual-quality food, keep routines steady, and call your vet if she hasn't eaten within a day — especially if hiding, vomiting or lethargy join in.
Why is my kitten not eating?
Kittens have almost no reserves and crash fast — PetMD recommends treating a kitten who won't eat as urgent rather than waiting it out. Skip the home tricks and call your veterinarian the same day.