Common illnesses in kittens: symptoms and treatments

20 March 2025 - 4 min read
Image of an orange cat with three of her kittens drinking her milk

Bringing a kitten home is an exciting time, but it can get stressful when your kitten is sick, struggling with an illness, or isn't feeling 100%.

Early detection and veterinary care are essential, so knowing the most common illnesses means you'll know when to get help.

We know having a sick kitten is difficult, but don't worry - we're here to help. Here, we list the most common illnesses in kittens, what causes them and the treatment options.

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Signs your kitten might be sick

Adopted kitten taking his first steps out of a pet carrier to his new family and home

It depends on what they're dealing with, but generally, signs your kitten is unwell include:

  • Appetite loss

  • Behavioural changes, like hiding or excessive vocalisation

  • Change in eating habits

  • Coughing

  • Diarrhoea

  • Lethargy

  • Nasal discharge

  • Sneezing

  • Vomiting

Kittens may experience different issues than older felines, but our article on the most common cat health issues can help too.

But for more tailored advice, see our common kitten illnesses below.

Common kitten illnesses

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Cat flu (feline upper respiratory infection)

Cat flu in kittens, also known as feline upper respiratory infection (URI), is a highly contagious illness in kittens. It's like our common cold or flu.

The most common viruses that cause it are feline calicivirus (FCV) and feline herpesvirus (FHV). Sometimes, bacteria cause it.

Symptoms include:

  • Coughing

  • Eye or mouth ulcers

  • Fever

  • Lethargy 

  • Loss of appetite 

  • Runny nose and eyes   

  • Sneezing 

Treatment involves supporting your kitten and providing hydration, general care and antiviral medication (if needed). It's more about managing symptoms and most cases are very mild and self-limiting.

Ear mites

Ear mites are a common, contagious problem in kittens, and they usually catch them from their mother and other adult cats.

Ear mites are microscopic parasites that live in the ear canal of animals like cats and dogs.

Symptoms include:

  • Black, brown debris in ears

  • Excessive scratching

  • Head shaking

Treatment includes prescription ear drops and preventative ear cleaning.

Feline parvovirus (feline panleukopenia)

Feline parvovirus, or feline panleukopenia, is a highly contagious and potentially fatal disease. It's one of the things kitten vaccines protect against.

The disease attacks cells which grow quickly, like those in bone marrow and lymph nodes.

Symptoms include:

  • Abdominal pain

  • Dehydration

  • Diarrhoea

  • Fever

  • Lethargy

  • Loss of appetite 

  • Vomiting

Fortunately, most kittens are protected against this disease through vaccines, but if they get it, treatment includes antibiotics for secondary infections, intensive supportive care and IV fluids.

Fleas and ticks

Fleas and ticks are common on kittens, particularly if they're around outdoor cats or go outside.

Some common symptoms are:

  • Excessive scratching

  • Hair loss

  • Red skin, typically around the neck and back end

  • Visible fleas on your cat's fur, or dark flaky dirt on their skin

Treatment is relatively simple, with regular grooming and effective regular flea treatments. Our article on fleas in kittens discusses more.

Stomach upsets (kitten vomiting & diarrhoea)

Upset tummies are very common in kittens and can have numerous causes from diet changes to parasites to infections; it really varies. You should see your vet if it becomes severe or symptoms persist, but generally, you can treat mild cases at home.

Symptoms include:

  • Abdominal pain

  • Diarrhoea

  • Fever

  • Frequent vomiting

  • Lack of appetite

  • Lethargy

  • Weight loss

Make sure you're feeding your kitten properly with a nutritionally balanced diet suitable for their age, and remember to visit your vet if things get worse.

Worms and parasites

Parasites and worms are very common in kittens, and the severity of symptoms can range wildly. It's something you need to take seriously and treat early, and we recommend setting up a regular worming schedule.

There are multiple worms your kitten can catch, but the most common are hookworms, roundworms and tapeworms.

Symptoms include:

  • Bloated belly

  • Diarrhoea

  • Increased appetite

  • Visible worms in stool

  • Weight loss

Treatment is usually just deworming medication from a vet and managing any secondary symptoms.

Our article on how to cure worms discusses more.

Preventative care tips

Image of a grey cat holding a pouch of catnip. It's using it as a toy and looks content.

Preventative pet care is an essential part of keeping your kitten healthy. The key areas are:

Deworming and parasite prevention

This can help prevent things like ear mites, fleas, ticks and worms in advance.

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Get your essential preventative treatments delivered to your door every month with the ManyPets Flea, Tick and Worm plan.

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Proper nutrition

A nutritionally balanced diet can keep your kitten healthy, growing properly and help them manage symptoms.

Regular check-ups

Regular check-ups are a key part of preventative pet care and can help spot issues early.

Vaccinations

We can't cover kittens who aren't vaccinated, and for good reason: they help prevent major, life-threatening conditions and you should get yours vaccinated.

You should read our vaccination guide if you have questions about costs, the process and how they work.

When to see a vet

black and white kitten behind bars in cage at shelter

You should see your vet if you're worried about your kitten's health or if symptoms worsen.

Warning signs that your kitten needs urgent medical attention include:

  • Decreased appetite

  • Dehydration

  • Diarrhoea

  • Lethargy

  • Sudden, severe behaviour changes

  • Symptoms that worsen or don't go away

  • Vomiting

  • Weight change

Generally, contact your vet if anything comes up that worries you or if your kitten is struggling to get over symptoms.

How kitten insurance helps

Kitten insurance can help you stay proactive and prepare for the unexpected.

Remember: early detection and treatment can be key, and kitten insurance provides a safety net for you and your kitten (terms apply). 

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We know your cat knows best. But let's keep them protected from any unexpected accidents or illnesses - just in case.

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Ben Newman
Editorial Content Lead

Ben is a writer and editor with years of experience in insurance. After spending a long time creating content for some of Britain's biggest brands as part of a marketing agency, Ben began to focus on insurance and hasn't looked back since. When he's not consuming copious cups of tea, you can find him reading a book, daydreaming about having an Australian Shepherd and shouting at Liverpool on the TV.