Common Cat Diseases and Symptoms: A Complete Guide for Cat Parents
Common Cat Diseases and Symptoms: A Complete Guide for Cat Parents
Learn about common cat diseases, the warning signs to watch for, when your cat needs veterinary care, and simple ways to support your cat's health every day.
Common Cat Diseases Every Cat Parent Should Know
Cats are very good at hiding when something is wrong. A cat that is feeling unwell may not cry or obviously show pain. Instead, you may notice small changes in everyday habits.
Maybe your cat is sleeping more than usual. Perhaps it has stopped finishing its food, is drinking more water, is hiding under the bed, or is suddenly spending much more time at the litter box.
These changes may seem small, but they can sometimes be the first signs that your cat is developing a health problem.
The important thing is to know what is normal for your own cat. When you understand your cat's usual eating, drinking, sleeping, grooming and toilet habits, unusual changes are much easier to notice.
This guide explains some of the more common health conditions seen in cats and the symptoms that cat parents may notice at home.
Many different diseases can cause similar symptoms. The information in this article is for general pet-care education and is not a substitute for a veterinary examination or diagnosis.
Signs That Your Cat May Be Sick
Before looking at individual diseases, it helps to know the general signs that something may not be right.
A single change does not always mean your cat has a serious illness. However, if a change is sudden, severe, or continues, it is worth paying attention to.
If your cat suddenly behaves differently from normal, do not ignore the change simply because it still looks comfortable.
1 Feline Upper Respiratory Infection
Upper respiratory infections are among the more common illnesses affecting cats. They can involve the nose, throat, eyes and upper airways.
Viral infections are common causes, although bacteria can also be involved. Cats living in multi-cat environments may have a greater chance of being exposed.
Common Symptoms
- Sneezing
- Runny nose
- Watery eyes
- Eye discharge
- Nasal congestion
- Fever
- Reduced appetite
- Tiredness
- Coughing
What Cat Parents Should Do
Keep your cat comfortable and monitor eating, drinking and breathing. If symptoms are persistent, severe, or your cat stops eating, contact a veterinarian.
If your cat is struggling to breathe or breathing with its mouth open, seek veterinary care immediately.
2 Feline Calicivirus
Feline calicivirus is a contagious viral infection that commonly affects the respiratory system and mouth.
Some cats develop only mild respiratory signs, while others may develop painful sores in the mouth that make eating uncomfortable.
Possible Symptoms
- Sneezing
- Nasal discharge
- Eye discharge
- Fever
- Reduced appetite
- Mouth ulcers
- Drooling
- Tiredness
- Mouth pain
Vaccination and good preventive care can help reduce the risk of serious infectious disease. Your veterinarian can recommend the vaccination schedule that is appropriate for your cat.
3 Feline Herpesvirus
Feline herpesvirus is another important cause of respiratory and eye problems in cats.
Some cats can carry the virus for a long time and experience symptoms again during periods of stress or when their health is affected.
Signs You May Notice
- Sneezing
- Runny nose
- Watery eyes
- Conjunctivitis
- Eye irritation
- Fever
- Reduced appetite
- Tiredness
When to Get Help
Repeated eye infections or respiratory symptoms should be checked by a veterinarian, particularly if your cat is not eating or seems uncomfortable.
4 Feline Panleukopenia
Feline panleukopenia is a serious and highly contagious viral disease. It can be especially dangerous for kittens and cats that have not been vaccinated.
The illness can cause severe gastrointestinal problems and dehydration. A cat that becomes very weak or dehydrated can deteriorate quickly.
Possible Symptoms
- Fever
- Severe tiredness
- Loss of appetite
- Vomiting
- Diarrhea
- Dehydration
- Weakness
Prevention
Vaccination is one of the most important ways to protect cats against feline panleukopenia.
Ask your veterinarian about the vaccination schedule suitable for your kitten or adult cat.
5 Feline Immunodeficiency Virus
Feline immunodeficiency virus, commonly known as FIV, affects a cat's immune system.
One reason FIV can be difficult to notice is that an infected cat may appear healthy for a long time. Later, the weakened immune system can make it easier for other infections and health problems to develop.
Possible Signs
- Repeated infections
- Weight loss
- Fever
- Poor appetite
- Mouth inflammation
- Dental problems
- Skin problems
- Eye problems
- Respiratory infections
Testing
Testing can help determine a cat's FIV status, particularly when there has been possible exposure or unexplained recurring illness.
6 Feline Leukemia Virus
Feline leukemia virus, or FeLV, can affect a cat's immune system and may contribute to problems such as anemia, infections and certain cancers.
Some infected cats may not show obvious signs at first, which is why veterinary testing can be useful when exposure is suspected.
Possible Symptoms
- Weight loss
- Loss of appetite
- Persistent fever
- Pale gums
- Repeated infections
- Weakness
- Diarrhea
- Enlarged lymph nodes
Whether FeLV vaccination is suitable depends on your cat's age, lifestyle and risk of exposure.
7 Feline Infectious Peritonitis
Feline infectious peritonitis, commonly called FIP, is a serious disease associated with feline coronavirus.
FIP can look different from one cat to another. The symptoms can also depend on which parts of the body are affected.
Possible Symptoms
- Loss of appetite
- Weight loss
- Fever
- Tiredness
- Abdominal swelling
- Breathing difficulties
- Eye changes
- Neurological changes
If your cat has persistent fever, weight loss, weakness or other unexplained symptoms, veterinary examination is important.
8 Intestinal Worms and Parasites
Cats can pick up different intestinal parasites during their lifetime. Kittens can be particularly vulnerable, but adult cats can also become infected.
Some parasite infections are easy to miss. Others cause digestive problems, weight loss or a poor coat.
Possible Symptoms
- Diarrhea
- Vomiting
- Weight loss
- Bloated appearance
- Poor coat condition
- Reduced appetite
- Weakness
- Worms in stool
Parasite Prevention
Keep litter boxes clean and discuss a suitable parasite-control plan with your veterinarian.
Never give a deworming medicine simply because it worked for another cat. The right medicine and dose depend on the cat and the parasite involved.
9 Fleas and Common Skin Problems
If your cat is constantly scratching, licking or biting its skin, there may be an underlying skin problem.
Fleas are one possible cause, but allergies, mites, infections and other skin conditions can look very similar.
Signs to Watch For
- Excessive scratching
- Excessive licking
- Hair loss
- Red skin
- Scabs
- Flaky skin
- Small bumps
- Sores
Why Diagnosis Matters
Treating the wrong cause may not solve the problem. A veterinarian can help determine whether fleas, mites, allergies, infection or another condition is responsible.
10 Ear Mites and Ear Problems
Ear problems can be very uncomfortable for cats. Ear mites are one possible cause, particularly in kittens and cats that have close contact with other animals.
Possible Signs
- Frequent scratching around the ears
- Head shaking
- Dark material inside the ears
- Redness
- Bad smell
- Sensitivity around the ears
- Holding the head differently
Dirty-looking ears do not automatically mean ear mites. Bacterial infections, yeast and other ear conditions can cause similar signs.
11 Dental Disease in Cats
Dental problems are surprisingly easy to miss in cats. Some cats continue eating even when their mouth is painful.
Plaque can build up on the teeth and eventually contribute to tartar and gum inflammation. Other dental conditions can also cause significant discomfort.
Dental Warning Signs
- Bad breath
- Red gums
- Swollen gums
- Bleeding gums
- Yellow or brown tartar
- Dropping food
- Difficulty chewing
- Pawing at the mouth
- Reduced appetite
- Loose or damaged teeth
Keeping Your Cat's Mouth Healthy
Regular dental care and veterinary dental examinations can help protect your cat's teeth and gums.
If your cat seems uncomfortable while eating, arrange a veterinary examination rather than assuming it is simply being a picky eater.
12 Chronic Kidney Disease
Kidney disease is an important health concern, particularly in older cats. One of the difficult things about kidney disease is that early changes can be subtle.
A cat may continue behaving normally for some time before the signs become obvious at home.
Possible Signs
- Increased thirst
- Increased urination
- Weight loss
- Reduced appetite
- Vomiting
- Weakness
- Poor coat condition
- Dehydration
If your older cat suddenly starts drinking much more water or using the litter box more often, tell your veterinarian.
13 Diabetes in Cats
Diabetes affects the way a cat's body regulates blood glucose. Cats with diabetes may show noticeable changes in drinking, urination, appetite and body weight.
Possible Symptoms
- Increased thirst
- Increased urination
- Weight loss
- Increased appetite in some cats
- Weakness
- Poor coat condition
When to Talk to a Vet
If you notice a significant change in how much your cat drinks or urinates, do not ignore it. These changes can have several causes and should be assessed by a veterinarian.
14 Hyperthyroidism in Cats
Hyperthyroidism is commonly seen in older cats. It occurs when the thyroid glands produce too much thyroid hormone.
Some cats may seem unusually hungry while still losing weight. Owners may also notice increased activity or restlessness.
Possible Signs
- Weight loss
- Increased appetite
- Increased thirst
- Increased urination
- Restlessness
- Vomiting
- Diarrhea
- Faster heart rate
- Poor coat condition
15 Urinary Problems in Cats
Urinary problems deserve special attention because some urinary conditions can become emergencies.
You may notice your cat making repeated trips to the litter box, straining to urinate, crying while urinating or passing only a very small amount of urine.
Warning Signs
- Frequent litter-box visits
- Straining to urinate
- Crying while urinating
- Blood in urine
- Urinating outside the litter box
- Excessive licking
- Producing very little urine
Do Not Wait If Your Cat Cannot Urinate
If your cat repeatedly tries to urinate but little or no urine comes out, seek veterinary care immediately.
Do not wait to see whether the problem gets better on its own.
16 Vomiting and Digestive Problems
Cats may occasionally vomit a hairball, but repeated vomiting is something cat parents should take seriously.
Digestive problems can have many possible causes, including dietary changes, parasites, infections and other illnesses.
Contact a Veterinarian If Your Cat Has
- Repeated vomiting
- Persistent diarrhea
- Blood in vomit or stool
- Severe constipation
- Loss of appetite
- Abdominal pain
- Dehydration
- Significant weakness
17 Eye Problems in Cats
Cats can develop several different eye conditions. Some may be mild, while others can become serious if treatment is delayed.
Eye Warning Signs
- Redness
- Watery eyes
- Eye discharge
- Squinting
- Cloudiness
- Swelling
- Keeping one eye closed
- Sudden vision problems
- Changes in pupil size
Eye problems can sometimes threaten vision. If your cat suddenly develops a painful, cloudy, swollen or closed eye, arrange veterinary care promptly.
18 Ringworm in Cats
Despite its name, ringworm is not caused by a worm. It is a fungal infection that affects the skin and hair.
Ringworm can spread between animals and people, so suspected cases should be handled carefully and checked by a veterinarian.
Possible Signs
- Patchy hair loss
- Flaky skin
- Red skin
- Circular skin lesions
- Scabs
- Skin scaling
Why Diagnosis Is Important
Several skin conditions can look similar to ringworm. Veterinary testing can help identify the actual cause and guide appropriate treatment.
19 Heartworm Disease in Cats
Heartworm disease can affect cats after transmission by mosquitoes. The infection can affect the lungs and respiratory system.
Cats can sometimes develop serious respiratory problems, and prevention is an important part of parasite care.
Possible Signs
- Coughing
- Breathing difficulties
- Rapid breathing
- Loss of appetite
- Weight loss
- Vomiting
- Lethargy
Even cats that spend most of their time indoors can be exposed to mosquitoes. Ask your veterinarian what prevention is appropriate.
20 Cancer in Cats
Cancer can occur in cats, particularly as they become older. There are many different types of cancer, so the symptoms can vary greatly.
A new lump does not automatically mean cancer, but unexplained changes should not be ignored.
Possible Warning Signs
- Unexplained weight loss
- Reduced appetite
- Persistent lumps
- Sores that do not heal
- Repeated vomiting
- Persistent diarrhea
- Difficulty breathing
- Unusual bleeding
- Changes in behavior
However, any new lump, unexplained weight loss or persistent change in your cat's health should be discussed with a veterinarian.
Common Cat Diseases and Symptoms Chart
| Condition | Common Signs | What Cat Parents Should Do |
|---|---|---|
| Respiratory Infection | Sneezing, nasal discharge and eye discharge | Monitor closely and seek veterinary advice if persistent or severe |
| Calicivirus | Sneezing, fever, mouth ulcers and reduced appetite | Arrange a veterinary examination |
| Panleukopenia | Vomiting, diarrhea, weakness and dehydration | Seek prompt veterinary care |
| FIV | Repeated infections, weight loss and mouth problems | Discuss testing with a veterinarian |
| FeLV | Weight loss, weakness, infections and pale gums | Discuss testing and prevention |
| Intestinal Parasites | Vomiting, diarrhea, weight loss and bloating | Discuss parasite testing and treatment |
| Skin Problems | Itching, hair loss, redness and scabs | Find the underlying cause |
| Dental Disease | Bad breath, tartar, red gums and chewing problems | Arrange a dental examination |
| Kidney Disease | Increased thirst, urination and weight loss | Arrange a veterinary checkup |
| Diabetes | Increased thirst, urination and weight loss | Discuss the changes with a veterinarian |
| Urinary Problems | Straining, frequent litter visits and blood in urine | Urgent care if your cat cannot pass urine |
| Ringworm | Hair loss, flaky skin and skin lesions | Arrange veterinary diagnosis |
| Heartworm | Coughing, breathing problems and lethargy | Discuss prevention with your veterinarian |
When Should You Take Your Cat to the Vet Immediately?
Some symptoms should never be ignored or watched at home for too long. If your cat appears seriously unwell, contacting a veterinarian quickly can be important.
Emergency Warning Signs
- Difficulty breathing
- Collapse
- Seizures
- Severe weakness
- Blue or very pale gums
- Heavy bleeding
- Suspected poisoning
- Severe injury
- Inability to urinate
- Sudden loss of vision
Other Concerning Changes
- Repeated vomiting
- Persistent diarrhea
- Sudden appetite loss
- Rapid weight loss
- Extreme hiding
- Major behavior changes
- Persistent coughing
- Major drinking changes
- Major urination changes
How Can You Help Prevent Cat Diseases?
You cannot prevent every disease, but regular care can reduce many health risks and make it easier to notice problems early.
Keep Vaccinations Updated
Follow the vaccination schedule recommended by your veterinarian. Vaccination helps protect cats from several serious infectious diseases.
Use Appropriate Parasite Prevention
Ask your veterinarian about flea, tick, heartworm and intestinal parasite prevention that is suitable for your cat.
Feed a Suitable Cat Food
Choose complete and nutritionally appropriate cat food based on your cat's age, life stage, activity level and individual needs.
Always Provide Fresh Water
Fresh drinking water should be available every day. Keep water bowls clean and place them where your cat feels comfortable drinking.
Look After Dental Health
Regular dental care can help maintain healthy teeth and gums. Ask your veterinarian about suitable dental-care options.
Keep the Litter Box Clean
A clean litter box is better for your cat and makes it easier for you to notice changes in urine or stool.
Schedule Regular Veterinary Checkups
Routine veterinary examinations can help identify health problems before they become obvious at home.
Simple Daily Health Check for Your Cat
You do not need to perform a complicated examination every day. Simply paying attention to your cat's normal routine can tell you a lot.
Food
Did your cat eat normally today?
Water
Is your cat drinking around the same amount as usual?
Litter Box
Is your cat urinating and passing stool normally?
Behavior
Is your cat behaving the way it normally does?
Grooming
Is your cat grooming normally?
Eyes and Nose
Do the eyes and nose look clear and normal?
If something feels different and the change continues, do not ignore it. Your veterinarian can help determine whether there is an underlying health problem.
Cat Care Products
Good nutrition, parasite prevention, grooming, dental care and regular veterinary attention are all part of responsible cat care.
Cat Food
Choose suitable cat food according to your cat's age, life stage and nutritional requirements.
Shop Cat FoodCat Deworming
Explore parasite-care products and deworming options. Always use the appropriate product and dose recommended for your cat.
Shop Cat DewormingCat Grooming
Find grooming essentials to help maintain your cat's coat and everyday hygiene.
Shop Cat GroomingCat Dental Care
Support your cat's oral hygiene with suitable dental-care products and regular veterinary checks.
Shop Dental CareVeterinary Consultation
If you are worried about your cat's symptoms, speak with a veterinarian instead of trying to diagnose the problem yourself.
Consult a VetFrequently Asked Questions About Cat Diseases
What are the most common diseases in cats?
Cats can develop many different health conditions. Common concerns include respiratory infections, parasites, dental disease, urinary problems, kidney disease, diabetes, hyperthyroidism, skin problems and infectious diseases such as FIV and FeLV.
What are the first signs that a cat is sick?
Changes in appetite, drinking, urination, litter-box habits, grooming, energy, body weight or behavior can all be signs that something has changed.
Why is my cat hiding more than usual?
Cats may hide because of stress, fear, environmental changes or illness. If hiding is unusual for your cat and continues, especially along with appetite or behavior changes, contact your veterinarian.
Why is my cat drinking more water?
Increased thirst can have several causes. Kidney disease, diabetes and other health problems can affect drinking and urination. Persistent changes should be discussed with a veterinarian.
Why is my cat not eating?
Loss of appetite can happen because of illness, dental pain, stress, digestive problems or other causes. If your cat continues refusing food, contact your veterinarian.
Can indoor cats get sick?
Yes. Indoor cats can still develop infectious diseases, parasites, dental problems, urinary conditions, kidney disease and other health problems. Indoor living can reduce some risks, but it does not remove the need for preventive care.
Can I give human medicine to my cat?
Do not give human medicine to your cat unless a veterinarian has specifically instructed you to do so. Some medicines that are safe for people can be dangerous or toxic to cats.
How often should my cat visit a veterinarian?
The ideal schedule depends on your cat's age, health, lifestyle and individual needs. Regular checkups allow your veterinarian to monitor your cat and identify changes early.
How can I prevent common cat diseases?
Regular veterinary checkups, appropriate vaccinations, parasite prevention, good nutrition, dental care, fresh water and a clean home environment can all support your cat's overall health.
Should I wait if my cat seems slightly unwell?
It depends on the symptoms. A minor change that quickly returns to normal may not be serious, but persistent or worsening symptoms should be discussed with a veterinarian. Emergency signs such as breathing difficulty or inability to urinate require immediate care.
Pay Attention to Changes in Your Cat
Cats cannot tell us when they are feeling unwell. That is why small changes in their everyday behavior can be important.
If your cat suddenly stops eating, hides more than usual, vomits repeatedly, develops breathing problems, drinks much more water, has trouble urinating, or simply does not seem like itself, pay attention.
When you are unsure, getting professional veterinary advice is safer than trying to diagnose the problem at home.
Consult a VetThis article is intended for general educational purposes only. Symptoms can have many different causes, and an online article cannot replace an examination by a qualified veterinarian.
If your cat has severe, sudden or worsening symptoms, contact a veterinarian promptly. In an emergency, seek veterinary care immediately.
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