Get

In Your Inbox

Catster is reader-supported. When you buy via links on our site, we may earn an affiliate commission at no cost to you. Learn more.

Pneumonia in Cats: Causes, Signs & Care (Vet-Approved Explanation)

sick cat in vet

Cats rely on healthy lungs to breathe normally, just as humans do. Any health condition that impacts the lungs’ ability to function is potentially dangerous for the cat, and pneumonia is one of the medical concerns. In this article, we will discuss what pneumonia is and what causes the disease in cats. We will also discuss the most common signs of pneumonia and how it’s treated, including what care you can expect to provide your sick kitty at home.

divider cat paws oct 2024

What Is Pneumonia?

By its simplest definition, pneumonia is an infection of the lungs. The inflammation leads to trouble breathing and insufficient oxygen in the cat’s blood. When healthy, the cat’s lungs push air in and out of the body, a process known as ventilation. Once inside the lungs, oxygen from the air is removed and replaced with carbon dioxide, which needs to leave the body.

The cat breathes out the waste carbon dioxide while the oxygen passes into the bloodstream and is distributed throughout the body. Pneumonia impacts lung function because it disturbs the vital oxygen distribution. The inflamed lungs often contain biological material like blood or fluid, which blocks oxygen from passing into the blood.

When inflamed, the lungs may not expand enough and limit the amount of air the cat can breathe in. A lack of oxygen in the cat’s blood impacts every body part and can be life-threatening if not treated quickly.

Sick cat in animal hospital
Image Credit: Kachalkina Veronika, Shutterstock

What Are the Signs of Pneumonia in Cats?

Some signs of pneumonia vary slightly depending on what’s causing your cat’s lung inflammation.

Here are some common early signs of pneumonia:
  • Open mouth breathing
  • Lethargy
  • Fever
  • Coughing
  • Breathing faster
  • Breathing more heavily
  • Loss of appetite

Your cat may also display signs of not feeling very well, such as a loss of appetite and lethargy. If your cat’s pneumonia progresses, you may notice more concerning signs, such as breathing with their mouth open and a bluish color to their gums.

What Are the Causes of Pneumonia in Cats?

Because the term pneumonia describes generalized lung inflammation, it’s essential to determine precisely what is causing that inflammation for effective treatment.

There are four leading causes of pneumonia:
  • Aspirating (breathing in) something other than air
  • Something infectious like bacteria or a virus
  • Fungus
  • Parasites

Aspiration pneumonia occurs when the cat inhales something foreign, such as vomit, medication, or food. Unlike air, the cat can’t breathe the substance back out, so it remains in the lungs, blocking the oxygen’s movement. Cats that are sedated or under anesthesia are also at risk of the condition because the gag reflex doesn’t function when they’re knocked out.

Upper respiratory viruses are common in cats and can sometimes spread to the lungs, causing pneumonia. Cats with feline leukemia or feline immunodeficiency virus (FIV) are more at risk for pneumonia because of their weak immune systems.

Bacteria can also cause pneumonia, possibly when an infection somewhere else in the body moves to the lungs from the bloodstream. Cats with viral pneumonia can develop a bacterial infection as a complication. Fungal pneumonia is uncommon in cats but does occur. Generally, an infection occurs when the cat inhales fungal spores that develop naturally in the soil.

Parasitic pneumonia is even rarer in cats. It’s caused by lungworms and generally only impacts stray and outdoor cats.

tired sick cat lying on bed
Image Credit: Natata, Shutterstock

How Do I Care for a Cat With Pneumonia?

The proper care for a cat with pneumonia will vary depending on the type of pneumonia and how sick they are. The first step is getting your cat to the veterinarian to diagnose the pneumonia. Your vet will listen to your cat’s lungs and ask questions about their health history, including whether they could have aspirated anything.

They may suggest other tests, like chest X-rays and bloodwork, to check for viral diseases. Sometimes, your cat will need specialized procedures to diagnose fungal pneumonia or determine the specific type of bacteria causing an infection. If so, your vet may refer you to a specialist if one is available in the area.

Once pneumonia is diagnosed, the next step is for your vet to determine how sick your cat is and whether they can be treated at home or in the hospital. Very sick cats may need IV fluids, medications, and oxygen to recover.

If your vet catches pneumonia early, you may be able to treat your cat at home. If a virus causes pneumonia, there is usually no effective medication. You must keep your cat warm and ensure they continue eating and drinking normally. Your vet may ask you to count your cat’s breathing rate several times daily and call or come back to the hospital if it increases.

You’ll generally need to give antibiotics or anti-fungal medications at home for bacterial and fungal infections. Drugs to calm inflammation and open the airways are sometimes prescribed. In the rare case of parasitic pneumonia, your cat will need medications to kill the lungworms.

Pneumonia can worsen before it gets better, so if you care for your cat at home, monitor them carefully. Successfully treating pneumonia can be a long process that does not end until the cat’s lungs are clear. Your vet may want to recheck chest X-rays multiple times before confirming that the pneumonia is gone.

divider 2 cats

Frequently Asked Questions (FAQs)

Is Pneumonia in Cats Contagious?

Fungal, parasitic, and aspiration pneumonia are generally not contagious. Occasionally, bacterial or viral pneumonia may be contagious to cats and dogs. Your vet will advise you whether you need to keep the sick cat separated from other pets while they recover.

You must also avoid letting the sick cat share dishes, toys, or other items. Some infectious causes of pneumonia can spread through these methods. After caring for your sick cat, wash your hands to avoid carrying germs to healthy pets.

Can Pneumonia in Cats Be Prevented?

Bacterial and viral pneumonia usually can’t be prevented. Keeping your cat indoors will minimize their risk of encountering parasites or fungi. Don’t let your cat dig in the soil of indoor potted plants, either.

One common cause of aspiration pneumonia is inhaling liquid medication. Many cats are hard to medicate, and the risk of inhaling the liquid increases if it’s difficult to administer. If you give your cat liquid medicine, do so slowly to give them time to swallow.

divider 1 paws

Conclusion

Any condition that harms a cat’s breathing ability can be frightening for an owner. Pneumonia is life-threatening if left untreated. As with most medical problems, the earlier treatment can begin, the better. If you suspect your cat has pneumonia, see your vet immediately. Anytime your cat has trouble breathing, treat it as a medical emergency and get to the closest vet!


Featured Image Credit: SeagullNady, Pixabay

Want content like this delivered to you?

Sign Up For Our Newsletter

News, insights, expert advice, and everything cat

* By submitting, you agree to our Terms & Conditions and Privacy & Cookies Policy.


How useful was this post?

Click on a star to rate (you can leave written feedback after clicking submit)

Help us improve Catster for pet parents!

Your feedback really matters.

What did you like about this post? Also how can we improve it?

Join the conversation

Leave a Reply

You’re very welcome to leave a comment or question. Please know that all comments must meet our community guidelines, and your email address will NOT be published. Let’s have a positive and constructive conversation.


Talk With A Vet Online

Peace of mind,
anywhere, anytime

Affordable vet advice

Catster Photo Contest: Cats of the Week Winners (January 15, 2026)

Every week our team gets the privilege of sorting through our readers photos to choose what cats will win this weeks contest! See...

Living With Cats When You’re Immunocompromised: Our Vet Explains the Risks, Options, & Provides Tips

While countless studies tout the physical and mental benefits of pet ownership, it can still be nerve-wracking for immunocompromised people to be around...

Can Cats Overdose on Catnip? Our Vet Answers

There is nothing quite like the amazing reaction many cats have with catnip. While individual cats’ responses to it can vary greatly, most...

4 DIY Cat Bridges You Can Build Today (With Pictures)

Our cats love to hang out in weird places. With some kitties, it seems like the higher up they can get, the more...

More related

What Kind of Cat Breed is Berlioz from the Aristocats? Disney Felines Explained

Duchess, Berlioz’s mother, is a white Turkish Angora cat. Therefore, it can be safely assumed that Berlioz from the Atistocats is also a...

Why Is My Cat Afraid of the Ceiling Fan? – 4 Possible Vet-Reviewed Reasons

Cats, like many other pets (and us), possess unique personalities. Some can be extremely brave and adventurous, while others can be more timid...

Nasal Cancer in Cats: Our Vet Explains When to Euthanize

Knowing when to say goodbye is often one of the hardest aspects of pet ownership. Perhaps you are wondering if you waited too...

National Cat DNA Day 2026: What Is It & How To Celebrate

National Cat DNA Day falls on September 19th of each year. It celebrates advancement in feline genetics, which can help prevent health problems...

Keep reading

Is Anthurium Toxic to Cats? Vet Approved Facts & FAQ

It’s important to know what kinds of plants pose a toxic threat to our pets. Cats in particular are known for messing around with plants, which can be very dangerous if they were to chew and ingest a toxic variety....

Catster_Is Anthurium Toxic to Cats

Can a Cat Detect Bed Bugs? Facts & FAQ

Cats have extraordinary eyesight and sense of smell and are well-known to excel at hunting. Many cat owners have also witnessed their cat catching a fly in midair! But if cats are such great hunters, including tracking down tiny spiders,...

young tortoiseshell and white norwegian forest cat lying in bed

Why Do Cats Hang Out in Weird Places? 4 Vet-Reviewed Reasons

Does your cat enjoy sleeping on your head? Perhaps they like snuggling up inside your favorite vase? Or maybe you can’t wash your hands in the bathroom because your cat is hanging out in the sink? Cats do seem to...

cat hanging out in the bathroom sink

Do Cats Pee Blood When Stressed? Vet-Reviewed Causes For Blood In Urine

Any health problem that affects your four-legged friend is cause for concern, especially if it seems like your cat is peeing blood. The presence of blood in the urine is called hematuria, and it can be caused by various underlying...

Why Does My Cat Lick My Face? 8 Vet-Reviewed Reasons for This Behavior

Kitty kisses can be cute and endearing, but being incessantly licked by a tongue that feels like sand can be uncomfortable and irritating to some people. For cats, it’s not always a positive or pleasurable experience, and it may actually...

Cat licking a woman's face

Feline AIDS: Vet-Reviewed Signs, Causes & FAQ

Feline AIDS is a retrovirus infection that attacks a cat’s immune system by targeting the white blood cells. This causes their immune system to become weaker than normal, putting them at higher risk of illness for diseases and complications completely...

hand holding cat's feline AIDS test with positive result

How to Cat Proof a Toilet Paper Holder: Vet-Reviewed Explanation & Tips

Cats are notorious for unraveling and shredding toilet paper, driving many a cat parent to despair. If your cat is wreaking havoc in the bathroom, it’s time to start looking into how you can cat-proof your toilet paper holders and...

mackerel tabby cat playing with roll of toilet paper

10 Best Poultry-Free Cat Foods in 2026 – Reviews & Top Picks

Cats are carnivores and need protein in their diet to be healthy and active. Chicken is an abundant ingredient in all types of cat foods, but turkey is also a popular option. While these proteins are healthy for the average...

cat eating chicken dinner