Signs Your Cat Is Stressed or Sick and What to Do About It

My friend Sarah noticed her normally playful tabby, Milo, had stopped jumping onto the couch and was spending entire days tucked behind the washing machine. She figured he was just being moody. Two weeks later, a vet visit revealed a painful urinary blockage that had been building the whole time. Stories like this are more common than you think. Knowing the signs your cat is stressed or sick can be the difference between catching a problem early and dealing with an emergency.

Cats are experts at hiding how they feel. This guide walks you through the stress signals, illness red flags, and subtle warning signs that most cat owners overlook, plus exactly what to do when you spot them.

How Do I Know If My Cat Is Stressed?

Cats do not show stress the way dogs or humans do. Their signals are quieter and easier to miss. Here are the most common cat stress symptoms to watch for:

Hiding More Than Usual

Every cat likes a cozy hiding spot. But if your cat suddenly starts spending hours under the bed or in closets when they normally hang out with the family, something is off. A sudden increase in hiding is one of the earliest and most reliable signs of stress or discomfort.

Changes in Eating or Drinking Habits

A stressed cat might eat noticeably less or skip meals entirely. Some cats go the opposite direction and start overeating as a coping behavior. Pay attention to any sudden shift in how much your cat eats or drinks. According to Cornell University College of Veterinary Medicine, changes in appetite are one of the most common early indicators that something is wrong with a cat's health or emotional state.

Excessive Grooming or Hair Loss

When cats feel anxious, they often groom themselves obsessively. This over-grooming can lead to bald patches, usually on the belly, inner legs, or flanks. If you notice your cat licking one area raw, that is not just a grooming habit. It is a stress response that can lead to over-grooming and hair loss and secondary skin infections.

Aggression or Sudden Mood Changes

A normally sweet cat that starts hissing, swatting, or biting when touched may be dealing with stress or pain. Sudden mood swings are your cat's way of saying something in their world feels wrong.

Litter Box Avoidance

Litter box avoidance is one of the biggest red flags for both stress and illness. If your cat starts going outside the box, do not assume it is a behavior problem. Stress, urinary infections, and digestive issues can all cause this.

Excessive Vocalization

Some cats become unusually vocal when stressed, meowing or yowling more than normal, especially at night. If your typically quiet cat suddenly has a lot to say, pay attention to what else might be going on.

What Are the Signs of a Sick Cat?

While stress symptoms are mostly behavioral, illness tends to show up as physical changes. Here are the key signs of a sick cat you should never ignore:

Lethargy and Sleeping More Than Normal

Cats sleep a lot, typically 12 to 16 hours a day. But there is a difference between normal napping and a cat that barely moves, shows no interest in food or play, and seems drained of energy. Lethargy that lasts more than a day is worth a vet call.

Vomiting or Diarrhea

An occasional hairball is normal. But repeated vomiting, especially if your cat is not eating or drinking alongside it, signals a problem. Diarrhea lasting more than 24 hours can quickly lead to dehydration, which is dangerous for cats.

Unexplained Weight Loss

If your cat looks thinner without any changes in diet, something could be going on internally. Weight loss in cats can point to diabetes, hyperthyroidism, kidney disease, or even cancer. According to the American Veterinary Medical Association, unexplained weight loss of even half a pound in a cat can be clinically significant.

Changes in Breathing or Coughing

Cats should breathe quietly and effortlessly. Open-mouth breathing, wheezing, coughing, or rapid breathing are all veterinary emergency signs that need immediate attention.

Discharge From Eyes, Nose, or Ears

Watery eyes, a runny nose, or dark discharge from the ears can indicate infections, allergies, or upper respiratory illness. If the discharge is colored (green or yellow) or your cat is pawing at their face, get to the vet.

Subtle Warning Signs Most Cat Owners Miss

The obvious symptoms get noticed. It is the quiet ones that slip through.

Slight Changes in Grooming Patterns

A cat that stops grooming will develop a dull, unkempt coat within days. On the flip side, a cat grooming one spot obsessively might be dealing with pain in that area. Both are easy to miss if you are not paying close attention.

Sitting Differently or Avoiding Jumping

If your cat suddenly stops jumping onto their favorite shelf or starts sitting hunched with their paws tucked underneath them, they could be in pain. Cats with arthritis, abdominal pain, or injuries often adjust their posture to manage discomfort. Watch for these cat body language signals carefully.

Drinking More Water Than Usual

Increased thirst is one of the most overlooked symptoms in cats. It often signals kidney disease, diabetes, or hyperthyroidism, all common in cats over 7 years old. If you are refilling the water bowl more often, mention it to your vet.

Stress vs Illness: How to Tell the Difference

This is where most cat owners get stuck. Many symptoms, like hiding, not eating, and litter box changes, overlap between stress and illness. Here is how to sort them out:

Side-by-Side Comparison Table

When a Behavior Points to Stress

Stress behaviors usually follow a triggering event: a move, a new baby, a new pet, construction noise, or a change in routine. If you can identify a recent change and the symptoms started around the same time, stress is the likely cause.

When a Behavior Points to Illness

Illness symptoms typically appear without an obvious trigger and tend to get progressively worse rather than fluctuating. Physical signs like weight loss, vomiting, discharge, or breathing changes almost always point to a medical issue rather than stress.

Can Stress Actually Make Your Cat Sick?

Yes, and this is something most cat owners do not realize. Chronic stress does not just make your cat unhappy. It can cause real, measurable physical illness.

Stress-Induced Cystitis (Feline Lower Urinary Tract Disease)

Feline lower urinary tract disease (FLUTD) is one of the most common stress-related conditions in cats. According to the ASPCA, stress is considered a primary trigger for feline idiopathic cystitis, causing painful inflammation of the bladder without any bacterial infection. Symptoms include frequent urination, straining, blood in the urine, and urinating outside the litter box.

Immune Suppression and Recurring Infections

Prolonged stress floods a cat's body with cortisol, which suppresses the immune system over time. This makes stressed cats more vulnerable to upper respiratory infections, skin infections, and slow wound healing. Immune suppression in stressed cats is well-documented in veterinary research.

Over-Grooming Leading to Skin Problems

Anxiety-driven over-grooming creates bald spots and breaks the skin barrier, opening the door to bacterial or fungal infections. What starts as a stress behavior becomes a medical problem that needs treatment.

Signs by Age: Kittens, Adults, and Senior Cats

Cats show stress and illness differently depending on their life stage.

Kittens (Under 1 Year)

Kittens who are stressed may cry excessively, refuse to play, or have recurring digestive upset like diarrhea. Because their immune systems are still developing, even mild stress can quickly lead to illness. Watch for lethargy, nasal discharge, and failure to gain weight.

Adult Cats (1 to 10 Years)

Adults tend to show stress through behavioral shifts: increased aggression, withdrawal, litter box problems, or changes in appetite. Illness in this age group often appears as unexplained weight changes, vomiting, or coat quality decline.

Senior Cats (10 Years and Older)

Senior cats are the trickiest because age-related changes can mask illness. Cat behavior changes when ill become harder to spot in older cats who are already less active. Watch closely for increased thirst, changes in litter box habits, weight loss, and stiffness. These often point to kidney disease, arthritis, or thyroid problems, all common in aging cats. According to Banfield Pet Hospital's State of Pet Health report, kidney disease affects roughly 1 in 3 cats over the age of 15.

When to Take Your Cat to the Vet

Not every symptom requires a midnight emergency visit. But some do.

Emergency Signs That Need Immediate Attention

Get to a vet right away if your cat shows any of these:

• Difficulty breathing or open-mouth panting
• Complete food and water refusal for more than 24 hours
• Blood in urine or stool
• Inability to urinate (this can be fatal within hours)
• Seizures or collapse
• Severe lethargy, barely responsive

Signs That Can Wait 24 to 48 Hours

These warrant monitoring and a vet call but are not immediate emergencies:

• One episode of vomiting with no other symptoms
• Slight appetite decrease with otherwise normal behavior
• Minor behavior changes like brief hiding or reduced play
• Occasional sneezing without discharge

How to Help a Stressed or Sick Cat at Home

While you are waiting for a vet appointment, or if the issue turns out to be stress-related, there are real things you can do right now.

Creating a Calm, Safe Environment

• Give your cat a quiet room away from noise, other pets, and foot traffic
• Add extra hiding spots: cardboard boxes, covered beds, or elevated perches
• Keep litter boxes clean and in quiet, accessible locations
• Consider a pheromone diffuser like Feliway, which mimics calming feline facial pheromones

Simple Comfort Steps Before the Vet Visit

• Maintain normal feeding times and routines as much as possible
• Offer fresh water in multiple locations around the house
• Avoid picking up or handling your cat excessively if they seem uncomfortable
• Keep noise levels low and minimize visitors
• Gentle, short play sessions can help if your cat shows interest

Frequently Asked Questions

Your Cat Is Counting on You to Notice

Learning to read the signs your cat is stressed or sick is one of the most important things you can do as a cat owner. Cats will not tell you something is wrong with words. They tell you through tiny shifts in behavior, appetite, grooming, and energy. The earlier you notice, the faster you can act, and the better the outcome for your cat.

Did this guide help you spot something you had not noticed before? Share it with a fellow cat owner who might need it, and drop a comment below with your experience. Your story could help someone else catch a problem early.