Signs Your Cat Is Stressed or Sick

If your cat has stopped eating her usual food, is sleeping somewhere new, or has become suddenly clumsy, the honest answer is that nobody can tell from the behaviour alone whether she is stressed or unwell. Not you, and not me. That is the single most important sentence on this page, and it is why the first section below is the one to read.

Most of what gets published as “signs your cat is stressed” is a list of symptoms. Here is that list, but it is the second section rather than the first, because a list handed over without its alternatives is exactly how a sick cat gets written off as a nervous one.

Start here: a behaviour change that appears suddenly is a veterinary question

A cat that has always been quiet and is now hiding is showing a change. A cat that hides when a visitor arrives has a preference. The distinction that matters is not how dramatic the behaviour is, but whether it is new.

The AAFP and ISFM environmental needs guidelines make the underlying point plainly. Another feline protective mechanism, they write, is to avoid showing outward signs of weakness, pain or illness, and this important survival behaviour often delays recognition of illness by humans. The same passage notes what that delay has produced: a mistaken impression that cats are independent and do not need regular medical care. A stoic cat is not a well cat. It is a cat whose pain signal is quieter than most people’s alarm threshold.

So the practical rule, and I did not invent it: if the change is sudden, or you cannot account for it, contact a veterinary clinic today. Not tomorrow, and not after a week of watching. Pain does not announce itself in cats, which is precisely why the absence of obvious distress is not reassurance.

I want to be direct about the limits of this article. I am not a veterinarian, I have not examined your cat, and nothing here is a diagnostic tool. What I can do is tell you what the guidelines say the categories are, so that you arrive at the clinic able to describe what changed rather than only how your cat seems.

What stress actually looks like in a cat

The 2015 AAHA behaviour management guidelines list the commonly recognised signs of nonspecific anxiety and distress, and they are worth reading in their original form because the list is longer and stranger than any summary of it. It is a single list for dogs and cats together rather than one for each, and it runs to nearly forty entries: urination, defecation, anal sac expression, panting, increased respiration and heart rate, trembling, muscle rigidity, lip and nose licking, grimacing, head shaking, salivation, excessive or out-of-context vocalisation, repetitive high-pitched whines, yawning, immobility or freezing, pacing, hiding or attempting to hide, escaping or attempting to escape, turning the head or body away, lowering the head or neck, an inability to meet a direct gaze, staring at a middle distance, a lowered body posture, lowered or droopy ears, dilated pupils, scanning, hypervigilance, shifting legs, lifting a paw, increased or decreased closeness to preferred associates, profound changes in eating and drinking, increased or decreased grooming, and possible ritualised or repetitive activities.

Two things in that list are worth stopping on. The first is that acute and chronic stress are distinguished by direction rather than severity: the guideline notes that acute stress is usually associated with a decrease in appetite and thirst, whereas chronic stress is often associated with an increase. A cat eating more than usual for months is not obviously “stressed” to an owner, and this is the line item that makes it possible.

The second is that the list is explicitly of nonspecific signs. Nothing in it is specific to stress, which is the point the next section makes.

A few specifics worth knowing, because they are commonly misread:

• Over-grooming. A cat licking itself until patches appear is a documented sign of stress. It is also easy to miss, because grooming is normal behaviour that has become excessive rather than behaviour that started.
• Relocating. A cat that abandons a favourite sleeping spot has usually had that spot reassigned by something, most often another animal in the house. The guidelines do put the emphasis on the cat’s sense of smell, so a change that looks like nothing to you can register as significant to the cat.
• Not eating. A stressed cat often eats less. This one carries the most risk of being misfiled, because not eating is also a gastrointestinal sign. That is the next section.

International Cat Care’s stress guidance is worth reading alongside this one, and is the more useful of the two for a household, because it is written for owners rather than for clinics.

Why pain and stress look the same, and what that costs you

Here is the part that most articles on cat stress leave out. The AAHA behaviour guidelines do not treat anxiety as a self-contained explanation: they stress the significance of veterinary evaluations to rule out any underlying medical conditions contributing to behavioural problems, which means a cat that has stopped using its tray or started hiding may be signalling discomfort rather than adjustment.

That is why there is no honest checklist here telling you which of your cat’s symptoms is stress and which is pain. Anyone giving you that checklist is handing you a triage decision they have no way to support. A behaviour change is a reason to be examined, not a symptom to be interpreted at home.

The owner-facing house-soiling article in the Journal of Feline Medicine and Surgery is blunter than most. A cat that starts soiling outside its tray requires a thorough physical examination and urinalysis. The point generalises past litter boxes: the behaviour is the symptom, and only a clinician can work out what is behind it, because it needs palpation, a sample, and a history you do not have.

What you can bring to that appointment is worth more than you might think. A record of what changed, roughly when, what you fed, what you altered in the house, and what you saw her doing. That history is often what turns an undifferentiated “she is just quiet” into a finding.

What you can change yourself, and what has to be a decision

The AAFP and ISFM environmental needs guidelines are organised around five concepts, which they call pillars, and the guideline’s own summary sentence covers all of them: a cat thrives when we provide a safe haven, multiple and separate food, water, toileting and scratching or resting areas, opportunities for play and predatory behaviour, and positive, consistent human-cat interaction, in an environment that respects how cats process sensory information. In their own headings, the five are:

1. Provide a safe place. A private and secure area, often raised, where the cat can retreat and feel protected. The guideline’s detail is worth having: if the cat cannot see a potential threat it feels safer, even if its whole body is not concealed.
2. Provide multiple and separated key environmental resources. Feeding, drinking, toileting, scratching, play and resting areas, each in its own location. The guideline gives a minimum: two resting areas, two feeding areas, two toileting areas, with food and water separated from each other and from the litter tray.
3. Provide opportunity for play and predatory behaviour.
4. Provide positive, consistent and predictable human-cat social interaction.
5. Provide an environment that respects the importance of the cat’s sense of smell.

Pillar 2 is the one that surprises people, because the numbers are modest and the separation is the point. Two litter trays is not a luxury; it means a stressed cat has one option that is not the one somebody else is using.

If you use that list, say where it came from. The framework is the guidelines’. The guideline is explicit that it was written for veterinarians, cat owners and care-givers to reduce stress, and it recommends against describing itself in the language of enrichment and modification because the cat’s environmental needs is the more accurate frame. Translating it into a household checklist is a step further than the guideline takes, and it is a reasonable thing to try rather than a validated instrument. Nothing in it replaces an examination.

The honest summary of what we do not know

Two things are genuinely unsettled, and I would rather name them than paper over them.

First, how much of feline anxiety is well characterised at all. The separation-related behaviour literature in dogs is considerably more developed than its feline equivalent, and a great deal written about cats extrapolates from it. The 2015 AAHA guidelines predate a fair amount of newer feline welfare work.

Second, why some cats show stress and others do not under identical conditions. The guidelines are explicit that many things count as stressors, and they offer no framework for predicting which cat will respond to which. If a page tells you your cat’s stress has one identifiable cause, it is more confident than the evidence supports.

When to stop reading this and call a clinic

Call today, and do not wait to see if it settles:

• The change is sudden, whatever its apparent severity.
• Your cat has stopped eating entirely, or is eating and producing noticeably less.
• There is new straining, vocalising, or any change in the litter tray.
• Your cat is hiding more than usual and you cannot account for it.
• Anything involving breathing, an injury, or a possible toxin.
• Your cat is older and something has changed. The 2023 AAHA senior care guidelines are explicit that old age is not itself a diagnosis, and they treat behaviour change in an older animal as something to assess rather than something to retrain.

I am not going to give you a number here, some version of “if it persists beyond N days”, because the primary sources route this to a veterinarian rather than publishing a household threshold. Inventing one would be me making up clinical guidance. If you want that boundary, the clinic sets it.

If it turns out to be behavioural

Then the work is slow and unglamorous. Change one thing at a time, keep notes, and give it weeks. Behaviour change in cats is a months-long project, and a household that changes six things at once cannot tell which one worked. The environmental needs guidelines are the best starting framework, and International Cat Care’s owner-facing material is the most usable version of it.

If it turns out to be medical, you will be glad you went in. That asymmetry is the whole point: the cost of an unnecessary examination is an appointment, and the cost of skipping a painful one is not comparable.

Every factual claim above traces to one of the sources listed below. Where a claim is my own inference rather than a source’s, I have said so at the point I made it.