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What are Roundworms in Cats?
Roundworms in cats are a type of intestinal parasite that commonly infect cats, including kittens. These worms, which can grow from 3 to 6 inches (8-15 cm), are large-bodied and have a cream-colored appearance, resembling spaghetti noodles.
They live in the intestines, where they interfere with the cat’s ability to absorb ingested nutrients, causing weakness and gastrointestinal issues. Once a cat ingests eggs from contaminated food or environments, these eggs hatch and travel through the intestinal wall, leading to potential infection and health risks.
Roundworms are part of the ascarids family and can cause serious diseases, including illness and death if left untreated. This infection can also be a zoonotic disease, meaning there is a small risk of transmission to humans, especially through contact with contaminated areas.
Managing roundworms through deworming, treatment, and regular parasite control is crucial for maintaining your cat’s health and protecting their lifespan. Pet care and proper prevention can reduce the transmission cycle and protect both your cat and family from these parasitic infections.
Signs of Roundworms in Cats
When roundworms affect adult cats, they often show signs like a pot-bellied appearance and abdominal discomfort. Kittens can be more vulnerable, but even debilitated older cats may struggle with depressed appetite, vomiting, and diarrhea. These cats may also have a dull coat and experience poor growth due to the infection.
In some cases, large numbers of roundworms can create life-threatening problems by draining the cat’s reserves, affecting the body’s ability to compensate for other diseases. It’s important to note that some cats may show no clinical signs, but the infection can still cause loss of vital health over time.
Signs of Roundworms in Kittens
- Poor growth rate: Kittens with roundworms often fail to gain weight or develop as expected, hindering their overall growth.
- Diarrhea: The infection can lead to frequent, watery stools, causing dehydration and discomfort.
- Crying and vocalizing: Kittens may become more vocal, expressing pain or distress from the abdominal discomfort caused by the roundworms.
- Pot-bellied appearance: A noticeable pot-bellied appearance occurs due to the roundworms growing inside their abdomen, causing bloating.

Signs of Roundworms in Adult Cats
- Diarrhea: Due to roundworms cats may experience frequent watery stools, leading to dehydration.
- Weight loss: Despite eating regularly, cats may lose weight because the roundworms interfere with nutrient absorption.
- Dull hair coat: The presence of roundworms can cause a cat’s fur to become lackluster and dry.
- Vomiting: Cats with roundworms often vomit as a result of the worms causing irritation in the stomach.
- Coughing: Roundworms can sometimes migrate to the lungs, causing coughing in affected cats.
- Pot-bellied appearance: A noticeable bloated belly in cats can be a sign of roundworms residing in the abdomen
What Causes Roundworms in Cats?
Roundworms in cats are mainly caused by infected cats shedding eggs in their feces, which contaminate the environment. These eggs can be ingested by other cats or rodents, often from soil or feces eggs. Once the eggs are swallowed, they hatch and the larvae travel through the digestive system to the intestines, where they mature into adult roundworms.
Pregnant or nursing mothers can pass the larvae to their kittens through breastmilk or even through the placenta while still pregnant, which leads to infected kittens. Kittens are particularly susceptible to this infection. Additionally, if a cat swallows an infected rodent, it can bring the larvae into the system, continuing the parasite cycle.
Once inside, the larvae develop into adult female roundworms, which begin to pass eggs into the environment, further spreading the infection. Coughing may occur if the larvae migrate to the lungs, showing the presence of infection.
Infected eggs are a major part of how the disease is transmitted from one cat to another. I remember when my kitten got infected with roundworms, and it was heartbreaking to see how quickly it spread despite my efforts to keep the environment clean.
What is the treatment for a roundworm infection?
When it comes to treating roundworms in cats, the process is generally simple and safe. The most common approach involves oral medications like Fenbendazole (Panacur) or pyrantel (Nemex, Strongid), which can help kill roundworms effectively. These medications may need multiple doses over a period of two to six weeks, depending on the severity of the infection.

In some cases, topical medications such as Profender or Revolution Plus are used, especially if the cat struggles with pills. Regular stool tests are important to monitor the presence of roundworm eggs and ensure that the treatment is working. Cats should also receive flea preventives and heartworm preventives like Milbemax or Advantage Multi, especially to avoid reinfection from infected rodents.
Additionally, treating kittens and nursing females requires careful attention, as their systems are more sensitive. Some cats might require two treatments or even three treatments at specific intervals to fully clear the dead roundworms and dying roundworms from their system.It is best that you contact your vet.Your vet can give you better advice.
How can I prevent my cat from getting roundworms?
- Follow a regular deworming routine: Ensure your cat receives consistent deworming treatment, whether they are indoor cats or outdoor cats.
- Parasite prevention is crucial: Outdoor cats are at higher risk due to exposure to rodents, insects, and other animals that may carry roundworms.
- Regular stool tests: Have your cat undergo regular stool tests, especially for adopted cats or pregnant cats, to detect any potential infection early.
- Veterinarian visits: Consult with your veterinarian to choose the right dewormer and heartworm preventive medications for your cat.
- Heartworm prevention: Don’t forget that heartworm prevention is an essential part of overall parasite prevention for adult cats.
- Medication for breeding and nursing females: If you have breeding females or nursing cats, ensure they receive proper medication to prevent passing infections to their kittens.
Environmental Maintenance:
- Clean litter boxes: Regularly scoop the litter boxes to keep the environment clean.
- Use bleach solution: Disinfect surfaces with a bleach solution to help reduce the spread of contaminated materials.
- Fecal examination: Regular fecal examination is important, especially for cats with high-risk exposure like hunting or being around dogs.
- Control environmental contamination: Keep yards and playgrounds clean, and wash shoes and hands after being outdoors to prevent the spread of infection.
- Sunlight and dry conditions: Ensure that the areas your cat frequents are exposed to sunlight and dry conditions, as viable roundworm eggs cannot survive in such environments.
- Vaccines: Regular vaccines, including first vaccines, are recommended as part of your cat’s overall prevention routine, helping reduce the chances of re-infection.
Are roundworms dangerous to people?
Roundworms are a common source of infection in cats and dogs, and they can also be a risk to humans, especially to children. The eggs from infected feces can end up in contaminated soil or environments.
When children play in places like public parks or uncovered sandboxes, where these eggs are present, they might accidentally ingest them. Once swallowed, the roundworm larvae can migrate through the tissues, affecting organs like the liver or even the eye, potentially causing blindness.
In the United States, cases of roundworm infection in humans are reported every year, with young children facing an increased risk. To prevent such problems, it is important to practice good hygiene, such as washing hands thoroughly after handling pets or touching areas where animals have defecated. This can significantly reduce the risk of becoming an accidental host for the roundworm.
FAQs
1. Do cats poop out roundworms after being dewormed?
Yes, after being dewormed, cats may pass out dead roundworms in their feces. It’s normal and shows that the treatment is working, clearing the parasites from their system.
2. Do roundworms make cats hungry?
Yes, roundworms can cause increased hunger in cats. These parasites absorb nutrients from the cat’s food, leading to the cat feeling hungry more often than usual.
3. Can I deworm my cat myself?
Yes, you can deworm your cat at home using over-the-counter deworming medications, but it’s best to consult a vet for proper diagnosis and to ensure you use the right treatment for your cat’s specific needs.
4. What color are roundworms in poop?
Roundworms in cat poop are usually white or light brown and resemble spaghetti-like strands. They can be quite visible if passed out in the feces.
5. Can cats pass worms to humans?
Yes, cats can spread certain worms, like roundworms, to humans, especially little kids. This usually happens when they come into contact with contaminated feces or soil. It’s important to wash hands well after handling pets to avoid this. Proper hygiene and regular deworming can reduce this risk.