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.

9 Most Common Illnesses & Diseases in Cats: Our Vet Answers

veterinarian doctor holds cat

Cats are masters at hiding signs of illness, no matter what age they are. So, it is important to have an understanding of the common illnesses and diseases these wonderful creatures may face—as a little knowledge goes a long way in potentially helping to recognize a disease or illness, before it becomes too much of a problem!

The types of issues that can cause cats problems do vary a bit, depending on the age of a cat, which can include issues with the urinary tract, teeth, obesity, and more.

Some of these illnesses you may not even have considered being a feline problem, such as high blood pressure. But believe it or not, cats can get high blood pressure, just like people! The following is a list of the more common illnesses and diseases that can impact our pet cats. Read on to learn more.

divider 1 paws

The 9 Most Common Illnesses & Diseases in Cats

1. Chronic Kidney Disease

Cats originated in the desert, where water conservation is critical to survival. Therefore, their kidneys are highly efficient at conserving water, which is one of the reasons many people don’t see their cats at the water bowl very often.

However, as with any living being that ages, their organ systems also age and become less efficient over time—the kidneys are no different. Add to this that the kidneys work to remove many toxins and harmful cellular byproducts from the bloodstream, making them fairly susceptible to damage. Kidney damage is even more likely if concurrent issues are peasant in the urinary tract, such as dehydration or blockages.

Chronic kidney disease itself is an umbrella term that loosely describes a decrease in the function of one or both kidneys. It does not specifically refer to what caused the damage—just that there is some impairment in how efficient the kidneys are at filtering the bloodstream and creating urine.

Many different clinical signs can be seen in cats that experience chronic kidney disease, including vomiting or nausea, loss of appetite, large or frequent urinations, weight loss, or poor haircoats. Chronic kidney disease can often be managed with medications at home, but once it develops, it is not reversible.

If you need to speak with a vet but can't get to one, head over to PangoVet. It's an online service where you can talk to a vet online and get the advice you need for your pet — all at an affordable price!

PangoVet_Mention-in-Content for PangoVet2 save money


2. Parasites

Many cats will be exposed to some form of parasites at some point in their lives. One of the more common parasites found in cats is fleas—even in indoor-only cats, believe it or not! And, if you didn’t know, fleas can carry a certain type of tapeworm, which means if a cat has fleas, there’s also a good chance they have tapeworms. The good news is that both of these issues tend to be quite treatable with the right approach.

For cats that start life as strays, therefore needing to catch their own food, this can expose them to intestinal parasites, such as roundworms, or protozoans like toxoplasma. Both of these can cause issues later in life, though thankfully, this tends to be rare. Parasites are often treated with a round (or two or three) of deworming. In the case of fleas, topical medications may be prescribed to treat the infestation.


3. Dental Disease

Dental disease is easily one of the most, if not the most, common disease vets see in young cats. Often starting around 5 years of age (though it can be as young as 2 or 3 years of age), cats can develop cavities, inflammation of their gums (gingivitis), and tartar buildup.

The good news, for those that are inclined to do-it-yourself, is that daily brushing of a cat’s teeth can help reduce tartar buildup. But remember that human toothpaste is toxic to pets, so use one designed for cats if you plan to do this!

The bad news, however, is that it doesn’t help to prevent cavities—as cavities for cats start inside the tooth and work their way out, destroying the tooth in the process. Once this happens, the only treatment is a dental procedure that involves extracting the affected teeth.

Other types of dental disease seen in cats can include fractured teeth, commonly in the tips of the fangs, or in the canines. But don’t worry—it is possible to do a root canal in a cat’s canine to fix the fracture in many cases!

close up examining cat's mouth with swollen gums
Image Credit: mojahata, Shutterstock

4. High Blood Pressure (Hypertension)

It’s not only people that can have high blood pressure; cats have become more and more frequently diagnosed with hypertension—the medical term for high blood pressure. Although it doesn’t seem to be connected to cholesterol levels in cats, unlike in humans, it can develop as a stand-alone issue, or as a secondary to other diseases, such as chronic kidney disease. Hypertension tends to be more of a problem in cats as they get older. Just like with people, it is treated with blood pressure medication, and regular checkups.


5. Obesity

Another similarity to humans, is that many adult pet cats are increasingly having trouble with being overweight, or just plain obese. And just like with people, this can lead to other concerns, including arthritis, insulin resistance and diabetes, and a host of other issues.

Many vets think that overfeeding, especially with treats and dry food, along with a combination of an indoor low-activity lifestyle, directly leads to obesity in pet cats. Therefore, feeding wet foods and encouraging daily exercise (cat running wheel, anyone?) can be key components in staying ahead of this illness.

Cat Body Condition Score Healthy Weight
You are free to use this image but we do require you to link back to Catster.com for credit

6. Weight Loss

Conversely, as cats become seniors, one of the more common illnesses seen is weight loss. Weight loss is not specific for any particular disease, but rather, a sign that something else more concerning is occurring. It is never normal for a cat to be “just losing weight”. If you see weight loss in your cat, it is definitely time to get them a checkup with their vet.


7. Abscess

Cats that go outside and encounter other animals, especially other cats, are at risk of getting in fights. While they may not always be the cat that starts the fight, any cat bite can lead to an infection called a cat fight abscess. These are basically pockets of infection that occur under the skin, within the region of a bite wound. They are caused by the bacteria in the cat’s mouth, which can infect the underlying tissues when teeth penetrate the skin.

Cats that are the instigators of such fights tend to develop abscesses around their head and shoulders, while cats that are trying to escape from such fights tend to get these abscesses around their hind end. Regardless, abscesses tend to be more of a nuisance than something of concern, as most are quite treatable with antibiotics prescribed from your vet. Sometimes, a very deep abscess will also need to be surgically drained.

thin cat with yellow eyes
Image Credit: Anastasiya Tsiasemnikava, Shutterstock

8. Inappropriate Urination

One of the most common illnesses seen in cats of all ages is inappropriate urination. This is another issue that describes more of a clinical sign than an actual single disease process. Inappropriate urination is defined as “the act of urinating outside the litter box.” It can be around the house, on walls, or on horizontal surfaces such as furniture, clothes, or beds.

Inappropriate urination can be caused by many different issues, which can vary depending on the age of the cat. However, some of the more common reasons that a cat may experience inappropriate urination include:

  • Urinary tract infections
  • Urinary crystals or stones
  • Poor litterbox husbandry
  • Urine marking or spraying (especially in intact male cats!)
  • Behavioral or stress

Treatments will vary depending on the underlying cause.


9. Vomiting

Vomiting in cats is a common reason that they present to the vet. Sometimes, there are other clinical signs as well, including weight loss, diarrhea, or a change in appetite. Vomiting is another feline issue that isn’t a specific disease, but rather, an illness that can indicate other concerns. Some of the diseases that can cause vomiting in cats include:

You are free to use this image but we do require you to link back to Catster.com for credit

divider 1 paws

If I Think My Cat Isn’t Well, What Should I Do?

If you think your cat may be experiencing any of the above, the next step is often a trip to see their vet. Your vet will generally start with a history, and a physical exam. Depending on what is found during the exam, next steps may include x-rays and/or stool or blood samples to investigate abnormalities.

How Can I Prevent Illness in My Cat?

Routine vet visits are key for catching illness and disease early in cats. Follow your vet’s recommendations as to whether your cat needs to be seen annually or more frequently.

However, there can be easy things to do at home to complement your cat’s health between their vet visits. Purchasing a scale to monitor their weight can alert you to early changes that might herald concerns. Ensuring they eat a healthy, balanced diet is also helpful.

One easy trick that might alert you to early changes in your cat’s health is closely monitoring the litterbox. If you see sudden changes to the size or number of urine or fecal clumps, that can be an early indication of issues with the urinary or GI tracts, which often means it’s time for a vet visit.

divider 1 paws

Conclusion

Knowing about the most common illnesses and diseases in cats can certainly be helpful when it comes to recognizing them in your own feline friend. If you do have concerns that any of these might be affecting your cat, the next step is to reach out to your vet for further guidance.

Read Also:


Featured Image Credit: H_Ko, Shutterstock

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

Love, Nala Cat Food Review 2025: A Detailed Look

If you’re like me (and so many other obsessive cat owners) and spend too much time on Instagram stalking adorable kitties, then you...

What’s the Cost of Cat Insulin in 2025? Price Guide & FAQ

Our feline friends can develop diabetes, and like us, they might require insulin. If your cat has been diagnosed with this disease, you’re...

How to Discipline a Maine Coon Cat (13 Tips & Tricks)

Discipling a cat is much different from working with a dog. Cats can be more territorial, and some breeds may even be prone...

Most Popular Cat Names That Start With A for Your Amazing Pet

Whether you’re searching for the perfect cat name that starts with “A” to match your new pet to their siblings or prefer the...

More related

Is It Ok to Put Ice Cubes in a Cat’s Water Bowl? Vet-Reviewed Pros & Cons

Most cat owners know that keeping a cat hydrated can sometimes be a challenge. Hydration is important for cats, and it’s even more...

We Interview Kylo Ren, the Cat Who Looks Like Adam Driver

If you’re a cat person on the Internet, you’ve probably heard of Kylo Ren (or Catlo Ren), the Oriental Longhair cat who bears...

Are Ladybugs Poisonous to Cats? Vet-Confirmed Toxicity

Ladybugs are small, brightly colored beneficial insects that can help any garden thrive to its fullest extent. They are exceptional friends to your...

Meditation and Cats: A Reflection

Hi, I’m Dr. Lauren! Read my introduction to learn more about me and my two adventurous cats, Pancake and Tiller. I have lived...

Keep reading

Can I Get a Prescription for My Cat Online? Vet-Approved Facts & FAQ

Have you ever had a sick kitty and wondered if you could simply get a prescription for your feline friend online? The answer is no, but you can get a prescription from your normal vet and fill that online. Most...

man-with-cat-using-laptop

10 Best Raw Cat Foods in 2025 – Reviews & Top Picks

The saying, “you are what you eat,” applies to cats too, and one diet that’s growing in popularity is raw food. Although more controversial than regular kibble or canned food, raw diets are designed to better mimic the way that...

tabby cat eating from metal bowl

Can Cats Eat Jell-O? Vet-Approved Nutrition Advice

Cat parents are always on watch when it comes to what their kitties eat. As a responsible owner, you need to ensure that your feline eats nutritious meals that are intended to keep them happy and healthy. As anyone who’s...

Can Cats Eat Jell-O

7 Best Cat Foods for Weight Gain (High Calorie) in 2025 – Reviews & Top Picks

Some cats are notoriously picky. No matter what food you put out for them, they turn up their noses and walk away from the food bowl. With hundreds of products available, you may struggle to select the right one for...

persian cat eating dry food from bowl

Treating Ear Mites in Cats: Vet-Approved Tips & Tricks

Cats have incredible ears! Their hearing range is over 10 octaves, more than dogs or humans, and they have 32 muscles in each ear to help them pinpoint sounds exactly. But that doesn’t make them immune to parasites. If your...

white orange cat with ear mites

Why Does My Cat Purr When They’re Asleep? Vet-Reviewed Feline Behavior

Is there anything sweeter than seeing a cat curled up in a cozy nook, purring in their sleep? We can’t think of much that beats it. But if you’ve ever wondered why cats purr in their sleep—and if they’re really...

cat under porch sleeping

Why Does My Cat Take My Spot? 5 Vet-Verified Reasons

When you became a cat parent, you probably didn’t expect to regularly give up your comfortable seat. Many cats have a knack for stealing our seats, whether it is the hard dining chair or couch. Getting up from your seat...

Scottish Shorthair cat lying on a velvet couch

10 Best Limited Ingredient Cat Foods in 2025 – Reviews & Top Picks

Choosing the right cat food can be pretty daunting, especially if your loved one has allergies or sensitivities to particular ingredients. Fortunately, there are special formulas available for your feline friend known as limited-ingredient cat foods. They have small ingredient...

feline cat eating on a metal bowl