Signs of a sick kitten: when to call the vet

Kittens sleep a lot — often 16 to 20 hours a day — and long stretches of napping aren't a sign anything is wrong. Hiding during the first days in a new home, a slightly reduced appetite for a day, and the occasional single vomit (especially after eating too fast) are all common and usually resolve on their own. Our first 48 hours guide covers what's typical during the adjustment period in more detail.

What separates normal from concerning is usually pattern and direction: a kitten who's a little quiet for a day and then brightens up is different from one who keeps getting quieter, or who pairs quietness with any of the signs below.

Bursts of intense play followed by sudden collapse into a deep nap — sometimes called the “zoomies” — are a completely normal part of kitten energy, not a sign of anything wrong. Mild, occasional soft stool during a food transition is also common; persistent diarrhea lasting more than a day is a different matter, covered below.

It also helps to know your own kitten's normal baseline rather than a generic one — some kittens are naturally more vocal, more cautious, or bigger eaters than others. A change from your kitten's own normal is a more useful signal than comparing them to a kitten you saw online or a sibling from the same litter.

Grooming habits are worth watching too. A kitten who suddenly stops grooming altogether, or who overgrooms one spot to the point of a bald patch, is showing a behavior change worth mentioning even if nothing else seems obviously wrong.

Mild, occasional sneezing with clear discharge is common, especially in kittens from a shelter or multi-cat foster environment, and often reflects a minor upper respiratory infection rather than an emergency. Persistent sneezing, thick or colored discharge, or noisy breathing that isn't labored is still worth a regular vet visit, just not necessarily an emergency one.

A normal resting breathing rate for a healthy kitten is typically somewhere around 20 to 30 breaths a minute, counted while they're calm and asleep rather than right after play. You don't need to count this routinely, but knowing roughly what's normal for your own kitten makes it easier to notice if something changes.

Coughing

Occasional coughing can be a hairball attempt that doesn't quite produce one, especially in a kitten who's recently started self-grooming more. Persistent coughing, or coughing paired with any breathing difficulty, is a different picture and worth a vet visit rather than assuming it's always hairball-related.

A kitten who skips part of one meal, especially during a stressful transition, usually isn't cause for concern. Going more than 24 hours without eating anything at all is different and needs a same-day call to your vet — kittens have very little reserve, and prolonged appetite loss can become dangerous faster in a small kitten than in an adult cat.

• Not eating anything for 24+ hours: call your vet the same day.
• Sudden increased thirst alongside other changes: worth mentioning at your next visit.
• Repeated vomiting (more than once or twice) or vomiting paired with lethargy: call your vet.
• A single vomit with a kitten who's otherwise acting normal: usually fine to monitor.
• Drooling combined with pawing at the mouth: can indicate mouth pain or a swallowed object — call your vet.

A kitten who approaches the bowl but then walks away without eating, repeatedly, is different from one who simply isn't interested in the food itself — the first pattern can point to mouth pain or nausea and is worth mentioning to your vet even if it hasn't reached the 24-hour mark yet.

Hydration

Gently pinch a fold of skin at the scruff and let go — in a well-hydrated kitten, it snaps back quickly. Slow-to-flatten skin, along with dry or tacky gums, suggests dehydration, which can build quickly in a kitten who isn't eating or is having ongoing diarrhea. This combination is worth a same-day call rather than waiting to see if thirst picks back up on its own.

Diarrhea lasting more than a day, or no bowel movement at all for two to three days, are both worth a call even if your kitten otherwise seems fine. For everyday litter box setup and troubleshooting that isn't medical, see our litter box training guide.

Visible worms, a pot-bellied appearance, or persistent soft stool in an otherwise active kitten often points to intestinal parasites — common, treatable, and usually caught at a routine stool check rather than something to self-diagnose at home.

Sudden lethargy — a kitten who won't get up, seems limp, or doesn't respond normally to being picked up — is a same-day concern, especially when it comes on quickly rather than gradually. Seizures, disorientation, or wobbliness when walking are always worth an urgent call as well.

Hiding on its own, especially in a new home, is usually normal adjustment rather than illness. What's different is hiding that's paired with not eating, not moving when you approach, or any of the other signs on this page — that combination is what shifts it from adjustment to a reason to call.

A kitten who cries out when picked up or touched in a specific spot, rather than just being generally unhappy about handling, is signaling localized pain and is worth a same-day mention to your vet, especially if it's a new reaction rather than a long-standing dislike of being held.

• Pale, blue-tinged, or yellow gums.
• Noticeable swelling anywhere, or a limb your kitten won't put weight on.
• Hot ears combined with lethargy or not eating, which can suggest a fever.
• Discharge from the eyes or nose that's thick, colored, or paired with squinting.
• A visibly bloated or hard abdomen.

Taking a kitten's temperature at home isn't necessary for most owners to do themselves, and an inaccurate reading can create false reassurance either way — if a kitten seems warm and is also acting unwell, that combination is enough reason to call, without needing a precise number first.

Coat and skin

Patchy hair loss, especially if it's spreading or the skin underneath looks red or scabbed, is worth a vet visit — it can point to a fungal infection like ringworm, parasites, or an allergy, all of which are manageable but worth identifying rather than guessing at home. Excessive scratching or grooming focused on one area is a similar signal worth mentioning.

Eyes and ears

Squinting, visible third eyelid, or cloudiness in one or both eyes are worth a same-day call, since eye issues in kittens can worsen quickly. Persistent head-shaking or scratching at the ears, along with a dark, waxy discharge, often points to ear mites or an infection — uncomfortable but very treatable once identified.

A fall, being stepped on, getting a paw or tail caught in a door, or slipping outside unexpectedly all warrant a vet check even if your kitten seems fine afterward — some internal injuries don't show obvious symptoms right away. This is especially true for falls from any height in an apartment; see our indoor safety guide for preventing this in the first place.

If you know or suspect your kitten ate something toxic, treat it as an emergency regardless of how they seem in the moment — see our foods toxic to cats guide for symptoms and first aid specific to poisoning.

A limp that appears suddenly after any kind of jump, fall, or rough play session is worth a same-day exam even if your kitten is otherwise acting normal — kittens are resilient, but a fracture or soft-tissue injury can look deceptively minor at first.

If another pet was involved — a scuffle with a resident dog or cat that broke skin — treat any bite wound as worth a vet visit, even a small one. Bite wounds tend to seal over the puncture while trapping bacteria underneath, which can turn into an abscess days later if left unchecked.

Not everything needs an emergency visit, but plenty of things are still worth a phone call to ask. Mild, ongoing sneezing, a small scab or wound that's healing on its own, mild itching without other symptoms, or a behavior change you can't quite explain are all reasonable to mention at a regular appointment or a quick call, rather than either ignoring them or rushing to an emergency clinic.

When in doubt, calling and describing what you're seeing costs nothing and gives a vet the chance to tell you whether it can wait — that's a better default than guessing either direction yourself. Most vet clinics are used to exactly this kind of call and would rather hear from you than have you wait it out unnecessarily.

Keeping a record helps

A quick note of what you noticed and when — even just a phone note — makes any call easier, whether it's urgent or routine. Patterns are often more useful to a vet than a single snapshot, and it's easy to forget exact timing once a few days have passed.

This is also a good habit to build early, well before anything seems wrong — a baseline of what's normal for your specific kitten makes any future change far easier to spot.