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.

How to Tell if My Cat Has Worms? 5 Vet-Reviewed Signs

Share

cat owner belly rubbing her cat

Parasitic worms are repulsive to think about, but they’re a common health problem for cats. Along with being off-putting, worms can cause severe complications for your cat if left untreated.

Fortunately, worms can be treated safely and effectively in cats, and there are numerous ways to prevent future recurrences. Worm infestations can be asymptomatic or severe, but the signs are clear if you know what to look for. Here are some likely signs your cat has worms.

divider single cat paw oct 2024

How to Tell If Your Cat Has Worms

1. Vomiting and Diarrhea

One of the most obvious signs of worms is vomiting or diarrhea. Intestinal worms get nourishment from the food in the digestive tract, causing damage and inflammation to the walls of the intestines. This can lead to vomiting and diarrhea.

Some worms, like hookworms, attach to the intestinal wall and feed on blood, leading to internal hemorrhaging and bloody diarrhea. They are less common but may still be present in cats.

cat-vomiting
Image by: Tunatura, Shutterstock

2. Mucus or Worm Parts in Stool

When your cat has worms, the intestines secrete mucus to defend against the parasitic invasion. This causes your cat’s stool to look slimy from the excess mucus. The segments or parts of the worms may break apart and show up in your cat’s stool as well.


3. Lethargy

As mentioned, worms are parasites and rob your cat of nutrients. As a result, your cat may become malnourished or anemic if the infestation goes on long enough. Without proper nutrition, your cat may become lethargic or fatigued more quickly than a healthy cat.

Ragamuffin cat hiding
Image by: Ryo Nagashima, Shutterstock

4. Dull Coat

Also related to nutrition, a cat with worms will have a dull coat and dry skin. Nutritional deficiencies often show in the health of the coat and skin. Worms consume vital nutrients your cat needs to maintain a healthy, shiny coat and well-moisturized skin, leading to a dull appearance and dry skin.


5. Appetite Problems

Cats with worms may have finicky appetites. They may become hungry from the nutritional deficiencies caused by the worms, eating more to make up the difference. Conversely, cats may refuse food at other times because of digestive upset or pain, leading to weight loss.

If you’re concerned about your pet’s well-being, we recommend you contact a veterinarian.

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!

Preventative wellness PGV mention keep cat healthy Preventative wellness PGV mention keep cat healthy mobile

divider cats oct 2024

Are Worms in Cats Dangerous?

Worms are naturally found in the digestive systems of many animals. As long as they are in small numbers, they don’t cause harm. When the parasite load becomes excessive, it can cause health and nutritional problems for your cat. It can be serious in any cat, but it’s more significant in kittens who are in development.

Worms steal vital nutrients, leading to stunted growth, dehydration, anemia, and malnutrition. This can also happen with worms that feed on blood, leading to severe anemia. Worms may rob your cat of vital nutrients directly from feeding off the food in the digestive tract and indirectly through diarrhea and vomiting. It’s like your cat is starving despite consuming plenty of healthy food.

grey cat eating food
Image by: Pixel-Shot, Shutterstock

Can the Symptoms Be Caused by Something Else?

Though these symptoms are signs of a worm infestation, they can be related to many other health problems. Diarrhea, for example, could be caused by something as innocuous as food that didn’t agree with your cat or as severe as toxicity from chemicals or poisonous plants. Other potential causes include bacteria, viruses, food intolerances, and allergies.

It’s vital to take your cat to the vet for any prolonged signs. An occasional bout of diarrhea or vomiting may be nothing to worry about, but if it continues, it warrants a vet visit. This is also true of other signs, such as fatigue or inappetence, which could be an off day or indicate something more insidious.

cat examined by Vets
Image by: Kzenon, Shutterstock

How to Prevent Worms in Cats

Worm infestations in cats can be prevented through good hygiene and year-round use of heartworm, intestinal worm, and parasite prevention. Yearly fecal exams at the vet can also help monitor for intestinal worms. You should always spot-clean the litter box daily, change out the litter, and disinfect the litter box at least once a month. This helps prevent exposure to contaminated feces.

If your cat spends time outdoors sometimes, you can remove their solid waste from the yard or flower beds to minimize exposure to parasites. Whether you have an indoor, outdoor, or indoor/outdoor feline, they need regular vet visits. Some worms and other parasites can be asymptomatic until the infestation is severe, but your vet can help you identify problems early on.

divider cat paws 2 oct 2024

Final Words

Worms are common in cats, but they shouldn’t be ignored. Left untreated, they can cause severe problems for your cats, including malnutrition and anemia. In addition, many of the signs of worms could also be caused by other health conditions, some of which are serious. Always schedule a checkup for your cat if you notice concerning signs, and commit to regular wellness exams as part of your preventative healthcare plan.


Featured Image Credit: Anna Hoychuk, Shutterstock

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

Ask Dr. Paola – Help! My Male Cat Gets Into Fights! (March 9, 2026)

Welcome to our “Ask Dr. Paola” series, where every Monday we bring expert advice straight from Dr. Paola Cuevas (MVZ) to help our...

Why Your Cat’s Poop Smells Like a Biohazard

Nobody enjoys litter box duty, but sometimes it gets unbearable. The smell hits you from across the room. You’re scooping faster, lighting candles,...

RIP Your Furniture? Not With This Guide to Cat Scratch Damage Control

Your couch looks like it survived a minor apocalypse. The curtains have mysterious vertical shreds. That new rug you splurged on is already...

Celebrating 15 Years as the Most Popular Resident of No. 10 Downing Street

For almost 300 years, a rather unassuming Georgian building of black bricks with a shiny black door has been the official residence and...

More related

Maine Coon Kittens for Sale in Oregon: Breeders List 2026

Catster advocates for adopting before shopping, though we fully understand there are many reasons for seeking a breeder. So, we encourage it to...

How to Brush a Cat: 8 Vet-Verified Steps

Whether you’re trying to control shedding or looking for a way to bond with your cat, brushing is an essential part of caring...

Do Cats Revenge Poop? Vet-Reviewed Behavior Facts

Our cats communicate their interests, likes, and dislikes through a long list of methods. Some do a series of vocalizations, while others rely...

Why Does My Cat Scratch the Sides of the Litter Box? 6 Vet-Reviewed Possible Reasons

Cats are odd little animals. They stare at us while we sleep, pounce at us as we walk past their hiding spot, and...

Keep reading

Why Is My Cat Acting Weird? 10 Vet Reviewed Reasons

From manic midnight zoomies to suddenly hiding away from you, cats do some pretty strange things. You know your cat’s “normal” behavior best, so it can be alarming when they do something that’s not only weird, but also out of...

sad sick cat in bed

Why Do Cats Purr? 5 Vet-Reviewed Reasons Behind the Behavior

There’s something soothing about sitting with a purring cat, but do you know the reasons behind that distinctive vibration? It’s commonly thought that cats purr when they’re happy and content. While this is true, it’s not the whole picture. Cats...

cat asking for cuddles

Why Does My Cat Keep Shaking Their Head? 8 Vet Approved Reasons

If you’ve noticed your cat shaking their head more than usual recently, it could be caused by several factors. It could be something really simple, like a scratch, that you can treat at home, or it might be something more...

tabby Canadian Sphynx cat tilting head

Does Garlic Kill Fleas On Cats? Vet Reviewed Effectiveness Safety Explained

In addition to warding off vampires, garlic has multiple dietary and medicinal virtues. This bulbous plant can spice up the flavor of almost any dish while taking care of your cardiovascular health, protecting your liver, and combatting infectious diseases. However,...

Garlic

Can Cats Eat Lobster? Vet-Approved Diet Facts & FAQ

Not only is lobster nutritious, but it’s also something we humans look forward to spoiling ourselves with, especially in certain parts of the world. If you’re wanting to share the enjoyment and give your cat the treat of a fancy,...

Can Cats Eat Lobster

Can Cats Eat Egg Yolk? Vet-Approved Nutrition Facts

The yolk of the egg is where most of the nutrients are found. It is packed with fat, which your cat can easily handle, and egg yolk can prove a healthy and nutritious treat for your cat. The high-calorie count...

Can Cats Eat Egg Yolk

Arm and Hammer Cat Litter Review of 2026: Recalls, Pros & Cons

Review Summary Cat litter is an essential item on any cat owner’s shopping list, and most of us have heard of Arm & Hammer, a brand that has been on shelves for over 170 years. All Arm & Hammer cat...

Arm & Hammer Cat Litter Review

How Do I Calm a Cat Down for a Bath? 6 Vet-Approved Tips to Try

Oh, the dreaded cat bath time. Thankfully, this process will only be necessary on exceptionally rare occasions, perhaps even never throughout your cat’s life. We can admit that we’re grateful for their stellar self-grooming abilities, but your cat may need...

Bubble bath a small gray stray cat

Love Cats? So Do We! Join the Catster Community

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.




Sign up for the Catster Email Newsletter

Stay informed with expert pet care insights delivered straight to your inbox! Discover professional guidance on animal behavior, feeding tips, trusted product picks, and much more.