If you are thinking my cat is sick, you are not alone; many cat owners think their cats are ill, but they do not know how serious it is. The majority of cat owners reach that point of concern before finding the definitive solution. The issue is that cats evolved to conceal pain and illness for as long as possible, so that by the time something really seems to be amiss, the illness may have progressed for days without you noticing.
This guide gives you exactly what you need: the 10 most reliable warning signs that your cat is sick. Each sign includes its likely meaning, urgency level, and next steps. It shows how to tell if your cat is sick or just stressed. It also tells you whether a symptom requires emergency treatment or can be monitored at home. Knowing when your cat is sick before it is too late and you have no choice but to take it to a veterinarian is one of the best things you can do as an owner.
Table of Contents
1. Why Cats Hide Illness From You
A cat may be extremely unwell inside but seem quite alright outside. Survival biology explains this. In the wild, predators target weak animals. Cats evolved to hide signs of pain or weakness as long as possible. That instinct does not turn off just because your cat is safe in the house.
This is a single significant fact to you as an owner: you cannot wait until symptoms become apparent. By the time your cat stops eating entirely, loses noticeable weight, or cries out in pain, the disease has often been progressing for weeks. When you have ideas of what subtle differences to observe, you will be able to detect issues very early. Previous treatment nearly invariably improves outcomes and reduces veterinary expenses.
What Does Normal Look Like for Your Cat?
You have to have a clear vision of what is right in the particular cat before you can see what is wrong. Begin to pay attention to:
- The amount of cat food and water you give him every day.
- The frequency of litter box use and the appearance it typically takes.
- The place where they sleep, their activity, and the extent of their grooming.
- Their behaviour towards other pets and people in the house.
You should be able to notice any sort of change out of that personal baseline even before you notice a recognisable symptom. And when you find yourself thinking, “I think my cat is sick, but I do not know,” you will want to give that feeling some consideration.
2. The 10 Signs Your Cat Is Sick
Watch for these ten indicators, as they may signal illness and indicate something might be off. Does not necessarily mean that one sign is serious. When two or more of them occur, then you are supposed to call a vet.
An interesting fact to note: kidney disease is common to about 1 out of 3 cats over the age of 15, and hyperthyroidism is common to about 1 in 10 cats over the age of 10, according to Cornell University College of Veterinary Medicine. Many of the following signs are early indicators of these conditions.
Sign 1: Not Eating Like Normal
One of the most visible symptoms of a poorly cat is refusing to eat, particularly if your cat usually has a hearty appetite, and all of a sudden, loses all desire to eat. Do not delay more than 24 hours before calling your vet if your cat is unwell and refuses to eat.
Cats can not afford to skip meals for too long. VCA Animal Hospitals says that a cat that does not eat for 24 to 48 hours is at risk of developing a severe liver disorder, hepatic lipidosis, that can be life-threatening within a very short time. An abrupt hunger is also noteworthy. The elderly cats exhibiting abnormally high hunger could be hyperthyroid or diabetic with an early onset of diabetes.
Red flags to watch for: Missing a full meal, eating significantly less than normal on two or more days, or suddenly feeling much hungrier than usual.
Sign 2: Drinking Too Much or Too Little
The first signs of severe illness in cats are changes in water intake, but most cat owners do not monitor this until something is evidently wrong.
A cat that drinks much more than normal might be experiencing kidney disease, diabetes or thyroid disease. A cat that drinks very little, or seems to be dehydrated, may be nauseated, have a fever, or have a problem with their fluid balance.
Watch: Your cat will always go to the water bowl, drink tap water or odd sources, or have signs of dehydration, like dry gums and sunken eyes.
Sign 3: Litter Box Changes
The litter box of your cat provides you with first-hand knowledge about the health of the cat. Any variation in frequency, output or behaviour in the box is worth noticing.
Urine blood is never good. A male cat that continues to go to the litter box and has little or no urine is a medical emergency. An acute urinary obstruction may cause death within 24-48 hours without medication.
Watch: Straining, but no output, blood in the urine or stool, going outside the box, or more or less than usual.
Sign 4: Hiding and Withdrawing
A normally sociable cat that suddenly hides away and becomes unreachable is trying to say something significant. When your cat is ill and hides, this behaviour, combined with any other indication listed here, should prompt a visit to the vet the same day.
The sick cats isolate themselves and their fellow pets. They require dark, closed, and quiet conditions, since the less stimulated they are, the safer they are when in pain or sick.
Look out: Hiding in an unusual location, refusing to emerge to eat or do other usual activities, or withdrawing when touched in places that are usually okay.
Sign 5: Vomiting More Than Usual
Cats do vomit, but it’s not necessarily a cause to worry. One or two hairballs a month is normal. What is out of the normal range:
- Three or more vomitings in a day.
- Several times a week, vomiting for more than a few days.
- Any vomit with blood in it.
- Vomiting, total loss of appetite and excessive fatigue.
If your cat is sick and refuses to eat, and vomiting is part of the process, it is a persistent symptom that should be investigated by the veterinarian, not managed at home.
Sign 6: Coat Looks Dull, Greasy, or Matted
A healthy cat cleanses itself all day. Loss of grooming is typically an indication that the cat lacks the energy to continue grooming or finds it too uncomfortable.
A single symptom worth noting: when my cat is ill and has a bad smell, especially a sweet or ammonia-like smell, it may indicate kidney disease or diabetes. The presence of an odd body odour in a cat is not merely a hygiene problem.
Monitor: Mats developing, greasy or flattened fur, visible dandruff, baldness, loss of normal texture and shine in the coat or a new or unusual body odour.
Sign 7: Lethargy or Noticeably Lower Energy
The key distinction here is not how much your cat sleeps but whether the sleep is significantly more than their personal normal, combined with reduced interest in food, play, and interaction.
Cats are known to sleep 12-16 hours/day. It is not the amount of sleep they get, but whether they are having much more sleep than they normally do, and whether other behavioural or appetite changes accompany this.
Watch: Excessively drowsy, no reaction to play or interaction, slow and cautious movement, trouble with physical activities they normally perform without difficulty (jumping onto a favourite surface).
Sign 8: Abnormal Breathing
Any form of open-mouth breathing in a resting cat that is not hot or physically exerted is seldom normal and warrants same-day veterinary attention.
Cats breathe through their nose. Open-mouth breathing, rapid breathing at rest, wheezing, or audible crackles can indicate a respiratory infection, asthma, heart disease, or fluid accumulation in the chest cavity.
Watch for: Mouth breathing at rest, laboured or unusually fast breathing, wheezing, crackling or rattling sounds, or your cat stretching their neck forward as if trying to get more air.
Sign 9: Discharge From Eyes or Nose
A sick cat’s eyes may show signs of squinting, swelling, cloudiness, or a partially open third eyelid. Any eye or nose discharge of any colour in a cat is worth a visit to the vet in the next 24 hours.
Nasal discharge and frequent sneezing typically indicate an infection of the upper respiratory tract, especially in unvaccinated cats that are in contact with other cats.
Watch: Coloured discharge of eyes or nose, new squinting, swelling noticeable around eyes, sneezing at several points in the day.
Sign 10: Losing Weight
Weight loss in cats is almost always a symptom of an underlying medical condition, not simply a sign of ageing. Common causes include kidney disease, diabetes, hyperthyroidism, dental pain that makes eating uncomfortable, and intestinal parasites.
Watch for: Ribs that are becoming easier to feel through the coat, a spine that feels more prominent than before, or your cat feeling noticeably lighter when you pick them up.
3. Why Is My Cat Being Sick? (Vomiting Explained)
Vomiting is one of the most common reasons owners search for answers about a sick cat. Not all vomiting carries the same level of concern, and knowing the difference helps you judge how urgently you need to act.
| Type of Vomiting | What It Means / What to Do |
| Hairball once or twice a month | Normal, no action needed |
| Clear foam, stomach appears empty | Low concern, watch for repeats |
| Undigested food shortly after eating | Likely eating too fast, try a slow-feeder bowl |
| Yellow or green bile | Empty stomach, medium concern |
| Three or more times in one day | Great concern, call your vet today |
| Blood in vomit, any amount | Urgent — go to the vet immediately |
| Vomiting combined with no eating and lethargy | Urgent — go to the vet immediately |
My Cat Is Being Sick After Eating
Unless my cat is sick immediately after eating, the most common reasons are that the cat ate too fast, has an allergy to the food, or is experiencing nausea due to an underlying condition. The first cause can be addressed with a slow-feeder bowl. If it occurs after each meal, regardless of the feeding procedure, increase it as advised by your veterinarian.
My Cat Is Being Sick Every Day
A cat that vomits daily is not in a one-time upset. This is indicative of chronic gastritis, inflammatory bowel disease, food allergy or systemic diseases such as kidney disease or hyperthyroidism. This requires an appropriate diagnosis; do not manage this at home.
My Cat Is Being Sick and Has Diarrhoea Together
This combination indicates a problem with the digestive system, be it a bacterial infection, parasites, or something the cat ingested that disagreed with it. Should it take longer than 24 hours, or if there is blood in the vomit or stool, call your vet immediately.
4. Is My Cat Sick or Just Stressed?
It is one of the most frequent questions among cat owners, particularly when they have moved to a different house, added a new pet to the family, or experienced any other major change in their routine. Even normal cats under stress alone may vomit, avoid litter boxes, lose interest in food, and become lethargic. These symptoms are indistinguishable from those of physical illness.
| Points Toward Stress | Points Toward Illness |
| Started immediately after a household change | Appeared without any obvious trigger |
| Litter box avoidance is the main issue | Multiple symptoms appear at the same time |
| The cat is eating but hiding | Weight loss, discharge, or breathing changes present |
| No physical symptoms | Symptoms lasting longer than five days |
| Started improving within three to five days | Getting worse, not improving |
The Practical Rule
Take time to reflect on what happened in the home recently. When symptoms occur immediately after a change, and your cat shows no physical signs, provide a quiet environment and a regular schedule for 3 to 5 days.
If symptoms persist after 5 days or a physical change is observed, such as weight loss, difficulty breathing, or blood in the urine or stool, treat it as an illness and call your vet.
5. How to Tell If Your Cat Has a Fever
A cat’s normal body temperature ranges from 100.5°F to 102.5°F (38°C to 39.2°C). A temperature above 104 F is a fever, and you should take your cat to a veterinarian immediately.
A myth frequently repeated with an important correction: you cannot tell the fever of a cat by feeling its nose. The sole sure way is a rectal thermometer. Rather, watch out for the following symptoms, which might indicate your cat has a fever:
- Warm ears that are warmer than normal.
- Chills, although in a hot room.
- Anorexia and extremely low energy.
- Cloudy, foggy or half-closed eyes.
- Abnormal fatigue and warm, dry nose.
The Skin Tent Test for Dehydration
Dehydration is often accompanied by fever. To check your cat’s hydration, gently pinch the skin behind the neck and release. It ought to go back to flat at once. If the skin remains raised or is slowly coming down, your cat might be dehydrated and needs to go to the vet.
6. Sick Cat Body Language: What to Look For
Cats do not tell you what is causing pain, but you can really know by the way they sit and the way they look at you, you know what you are dealing with.
Hunched Posture
When the cat sits with his back curled, head down, and each of his four legs clucked close to his body, he is usually in pain or discomfort. This does not appear like a relaxed loaf pose. The cat appears to be relaxed and at ease in the loft. The body appears braced, guarded, and tense in a posture of pain.
Facial Tension
Researchers at the University of Montreal developed the Feline Grimace Scale to measure pain in cats objectively. Key markers include squinted eyes, flattened ears, tense cheek muscles, and whiskers pulled backwards and downward. These are some of the clearest warning signs your cat is crying for help through body language alone.
Head Pressing
A cat pressing their head firmly against a wall, floor, or piece of furniture is a neurological warning sign. This requires immediate veterinary attention, not monitoring.
Sudden Hind Leg Weakness
Sudden weakness, dragging, or paralysis of the back legs is a medical emergency. It can indicate a blood clot blocking circulation to the hind limbs, a condition that is both life-threatening and causes severe pain.
Crying Out or Yowling Without Cause
Unexpected yowling or howling, particularly at night, signals that something is wrong. Combined with any other sign on this list, contact your vet without delay.
7. When to Go to the Vet Right Away
Some situations can wait until the next morning. Some cannot wait at all. Use this guide to decide clearly.
| Symptom or Sign | Urgency | What to Do |
| The male cat is producing no urine | EMERGENCY | Go to the emergency vet immediately |
| Open-mouth breathing at rest | EMERGENCY | Go to the emergency vet immediately |
| Pale, white, or blue gums | EMERGENCY | Go to the emergency vet immediately |
| Sudden hind leg weakness or dragging | EMERGENCY | Go to the emergency vet immediately |
| Seizure or collapse | EMERGENCY | Go to the emergency vet immediately |
| Not eating for 24 or more hours | SAME DAY | Call your vet today |
| Vomiting three or more times in one day | SAME DAY | Call your vet today |
| Eye or nose discharge | SAME DAY | Call your vet today |
| Diarrhoea lasting more than 24 hours | SAME DAY | Call your vet today |
| Single vomit, cat alert, and still eating | MONITOR | Watch for 24 hours |
| Mild sneezing in a vaccinated adult cat | MONITOR | Watch for 24 hours |
Suspected Poisoning
Symptoms of poisoning in cats often differ from those of a regular illness. They tend to appear suddenly and get worse quickly. Watch for:
- Sudden drooling or foaming at the mouth
- Trembling or seizures
- Dilated pupils
- Vomiting that starts abruptly
- Difficulty breathing or open-mouth breathing
- Collapse or sudden extreme weakness
- Pale, blue, or grey gums
Common household items toxic to cats include lilies, antifreeze, rat poison, paracetamol (acetaminophen), ibuprofen, some essential oils, onions, and chocolate.
Go to an emergency vet immediately in case your cat is trembling, collapsing, having seizures, or having difficulty breathing. Do not wait to determine whether symptoms improve on their own.
Do not try to make your cat vomit at home. No safe over-the-counter treatments are available for cats, and trying them can even make the situation worse.
To be sure whether your cat has come in contact with something harmful or not, call your poison control line:
- UK: Animal PoisonLine — 01202 509000
- US: ASPCA Animal Poison Control — 888-426-4435
Note: Both services charge a consultation fee. In all other countries, contact your nearest emergency veterinary clinic directly.
8. How to Help a Sick Cat at Home
If you are wondering what to do when my cat is sick, the first question is whether the situation requires a vet now or if it is appropriate to monitor at home for up to 24 hours.
When Home Monitoring Is Reasonable
- A single episode of vomiting with no blood, and the cat remains alert.
- Mild sneezing with no other symptoms in a vaccinated adult cat
- Slightly reduced appetite for one meal with otherwise normal behaviour and energy
If your situation is not in that list, call your vet rather than defaulting to home care.
Step-by-Step: How to Help a Sick Cat at Home Safely
Step 1: Keep fresh water available at all times. Cats that feel unwell become dehydrated faster than healthy cats. Place water bowls in multiple locations so your cat does not have to walk far to drink.
Step 2: Offer small, frequent meals. Large meals can worsen nausea. Offer a small amount every three to four hours. Plain boiled chicken breast with no seasoning, plain white rice, or a veterinary prescription gastrointestinal food are all appropriate options.
Step 3: Create a quiet, warm resting space. Sick cats need minimal stimulation and consistent warmth. Set up a comfortable spot away from noise, other pets, and high foot traffic.
Step 4: Place the litter box close to where they are resting. An unwell cat may not have the energy to walk to a litter box on another floor.
Step 5: Never give human medications. Ibuprofen, paracetamol, aspirin, and most other common human medicines are toxic to cats, even in very small amounts. Do not give anything unless a vet has specifically instructed you to do so.
Step 6: Gently brush them if they have stopped grooming. A sick cat often cannot maintain their coat. Light brushing prevents matting and allows you to check their skin and body for any unusual signs.
Step 7: Write down everything you observe. Note when symptoms started, how often vomiting has occurred, whether eating and drinking are happening, and any changes in litter box output.
Step 8: Set a clear 24-hour limit. If symptoms have not improved within 24 hours of starting home care, or if anything gets worse at any point, stop monitoring and call your vet.
9. My Cat Is Sick, and I Cannot Afford a Vet
My cat is sick, and I cannot afford a vet. This is a real situation that many cat owners face, and it deserves a direct answer. If my cat is sick and I have no money, here are the practical options available:
Contact the vet anyway and explain your situation. Many veterinary practices offer payment plans, especially for existing clients. Ask directly.
Look for a local animal charity or low-cost clinic. Organisations such as the PDSA (UK), the Humane Society (US), SPCA locations, and local animal rescues often provide free or reduced-cost veterinary care.
Apply for veterinary financial assistance. In the UK, the PDSA provides free and subsidised vet care to eligible pet owners. In the US, the Brown Dog Foundation, RedRover Relief, and the Pet Fund all offer financial assistance.
Use a veterinary school clinic. Veterinary teaching hospitals and university clinics often provide care at significantly reduced rates.
Call a vet helpline for free guidance. Many vet practices offer a brief free telephone consultation to help you understand the urgency of the situation.
Important: Do not delay care for a true emergency, hoping the situation will resolve on its own. Contact the clinic and explain your financial situation. Emergency vets deal with this regularly, and options often exist.
10. Warning Signs Your Cat Is Dying
It is a painful subject for any cat owner. Knowing these signs helps you make informed decisions for your cat and yourself.
Signs That a Cat May Be in Serious Decline
- Inability to eat or drink anything for over two days.
- Shallow, irregular or physically laboured breathing.
- Unable to move head or stand without support.
- Incontinence (bladder or bowel)
- Paws and ears which are cold to the touch.
- Partly open eyes which do not follow movement or react to light.
- Taking a single dark place and being in no way in motion.
- An observable change in body odour, occasionally sweet or abnormally strong.
When you are enquiring how to tell whether my cat is dying, three or more of these symptoms combined, especially the inability to stand, cold extremities, intolerance of all food and water, should make one think that there is something wrong. Get in touch with your vet immediately to get advice and help.
Frequently Asked Questions
How do I know if my cat is sick?
Look for changes away from your cat’s personal normal. Reduced appetite, increased hiding, changes in litter box use, vomiting, lethargy, or coat changes are the most common early signals. You know your cat better than anyone else does; trust that instinct.
My cat is sick but still purring. Does that mean they are okay?
My cat is sick but still purring, which isn’t necessarily a sign they are fine. Cats purr when content, but also when in pain, stressed, or unwell. Purring is a self-soothing behaviour as much as it is a sign of happiness. Do not use purring as a reason to delay seeking help if other signs are present.
Why is my cat getting sick repeatedly?
Vomiting more than two or three times in a single day is not normal and usually points to gastroenteritis, a digestive blockage, a food allergy, or a deeper condition such as kidney disease. A cat vomiting repeatedly should be seen by a vet within 24 hours. Go sooner if there is blood in the vomit or if the cat has also stopped eating.
If my cat is sick, can I get sick too?
Some cat illnesses are zoonotic, meaning they can pass from cats to humans. These include ringworm, certain bacterial infections, and toxoplasmosis. The risk is generally low for healthy adults but higher for pregnant women, young children, and people who are immunocompromised. Wash your hands thoroughly after handling a sick cat.
How do I know if my cat is dying?
Signs that a cat may be near the end of life include extreme weight loss, complete refusal of food and water for two or more days, breathing difficulties, inability to stand, and cold paws and ears. Contact your vet for guidance, pain management, and support.
How can I tell if my cat has a fever without a thermometer?
You cannot confirm a fever without a thermometer, but if your cat’s ears feel much warmer than usual, your cat shivers in a warm environment, you have a complete loss of appetite alongside lethargy, and your cat eyes are dull or partially closed, a vet check is appropriate.
Can indoor cats get sick easily?
Indoor cats are generally better protected from infectious diseases and parasites than outdoor cats. But they are not immune to illness. Kidney disease, hyperthyroidism, diabetes, dental disease, and obesity are all common in indoor cats. Regular annual vet check-ups matter just as much for indoor cats.
Is my cat stressed or sick?
Stress and illness produce nearly identical symptoms. If symptoms appear immediately after a change in the home and there are no physical signs, such as weight loss or breathing changes, stress may be the cause. If symptoms last more than five days or involve physical changes, treat it as an illness and call your vet.
What should I never give a sick cat?
Never give a cat ibuprofen, paracetamol, aspirin, or any medication made for humans unless a vet has specifically instructed it. Many medicines that are safe for people are toxic to cats. When in doubt, call your vet before giving anything.
How long can a cat go without eating?
No more than 24 to 48 hours safely. Cats that stop eating quickly risk hepatic lipidosis, a serious liver condition that can become fatal without treatment. If your cat has not eaten in more than 24 hours, call your vet that day.
What do I feed a sick cat?
Plain boiled chicken breast with no seasoning, plain white rice, or a prescription gastrointestinal food are appropriate starting points for cats with digestive upset. Feed small amounts every few hours rather than one large meal. Always keep fresh water available and easily accessible.
Conclusion
The most important thing you can do is notice changes early and act on them. What should I do if my cat is sick? Cats do not give warnings when something is amiss as other animals do. Being aware of what to watch, when to take action, and when it is safe to observe at home positions you to act at the appropriate time.
You should note any change in your cat that is not normal, even before a recognisable symptom becomes evident. A cat that is male and does not produce urine or one that breathes with its mouth open when it is resting requires urgent veterinary attention.
Call your vet when not sure. A two-minute phone call is never a bad choice compared to waiting to see what will happen.
About the Author
Great and very informative article! It clearly explains the warning signs every cat owner should watch for. I especially liked how you covered both early symptoms and emergencies in a simple way.
This guide can really help pet owners take action at the right time 👍