Cat Worms Explained: Symptoms & Prevention

Worms are a common health issue in cats, and even well-cared-for pets can pick them up. The good news is that with regular worming, a clean home environment, and early awareness of symptoms, most worm problems can be managed effectively and prevented from becoming more serious.

In this guide, we explain the most common intestinal worms in cats, the signs to look out for, and how to protect your cat with a sensible worming routine. If you are looking for everyday parasite prevention, you can also explore our cat flea, tick and worming products or browse the wider flea, tick & worming collection.

This article is intended for general guidance only and should not replace professional veterinary advice. If your pet is unwell or showing concerning symptoms, please contact your veterinary surgeon.

What are intestinal worms in cats?

Intestinal worms are parasites that live in a cat’s digestive system. They feed off the nutrients your cat consumes and can sometimes cause irritation, weight loss, digestive upset, or more serious health problems, especially in kittens or unwell cats.

Some cats with worms look completely normal, which is one reason why routine preventative treatment is so important. Others may show mild or more obvious signs depending on the type of worm, the number of worms present, and the cat’s age and general health.

Common types of worms in cats

Roundworms

Roundworms are one of the most common intestinal worms seen in cats in the UK. They are long, pale worms that live in the intestines. Kittens are particularly at risk, but adult cats can also become infected.

Cats may pick up roundworms by:

• Swallowing worm eggs from contaminated soil, litter trays, or grooming
• Hunting infected prey such as mice
• Picking up infection early in life from their mother

Roundworms can sometimes be seen in vomit or faeces and may look a little like strands of spaghetti.

Tapeworms

Tapeworms are another common parasite in cats. They are usually caught by swallowing infected fleas during grooming or by eating infected prey animals.

Rather than seeing the whole worm, owners often notice small white segments around the cat’s bottom, in bedding, or near the tail. These segments can look a bit like grains of rice.

If your cat has fleas, it is important to treat both the flea problem and the tapeworm risk. You can find suitable options in our cat flea, tick and worming products range.

Hookworms and other less common worms

Hookworms are less commonly discussed than roundworms and tapeworms, but they can still affect cats. These worms attach to the lining of the intestines and feed on blood, which can be more serious in young or vulnerable cats.

Although not every cat is at equal risk, your veterinary surgeon can advise on the most suitable worming treatment based on your cat’s age, lifestyle, hunting habits, and general health.

How do cats catch worms?

Cats can pick up worms in several ways, and even indoor cats are not completely risk-free.

• From grooming after contact with contaminated surfaces
• From swallowing fleas carrying tapeworm larvae
• From hunting mice, birds, or other prey
• From contact with infected faeces or soil
• From their mother, particularly in early life

Outdoor cats and keen hunters are usually at higher risk, but indoor cats may still be exposed through fleas, contaminated footwear brought into the home, or shared environments.

Symptoms of worms in cats

The signs of worms can vary. Some cats show very few symptoms, while others may become clearly unwell. Common symptoms to watch for include:

• Vomiting
• Diarrhoea
• Weight loss
• A bloated or swollen-looking tummy, especially in kittens
• Changes in appetite
• Dull coat condition
• Dragging the bottom along the floor
• Visible worms or worm segments in faeces, vomit, or around the back end

In kittens, worm burdens can become serious more quickly. Poor growth, weakness, or a pot-bellied appearance should always be taken seriously.

When symptoms may be more urgent

You should contact your veterinary surgeon promptly if your cat:

• Is a kitten and seems weak, underweight, or has diarrhoea
• Has repeated vomiting
• Stops eating
• Has blood in the faeces
• Seems lethargic or unwell
• Has ongoing digestive symptoms despite worming

Worm symptoms can overlap with other health conditions, so it is important not to assume parasites are the only cause.

Why regular worming matters

Routine worming helps protect your cat’s health and can also reduce the spread of parasites in the home environment. In some cases, certain worms can also pose a risk to people, particularly young children or those with weakened immune systems, so prevention is important for the whole household.

Regular treatment is especially helpful because many infected cats do not show obvious signs at first. A preventative approach is usually easier, safer, and more comfortable than waiting until the worm burden becomes significant.

How often should cats be wormed?

The right worming schedule depends on your cat’s age and lifestyle. Kittens need more frequent treatment than adults, and cats that hunt may need worming more often than those that stay indoors.

As a general guide, many cats benefit from regular routine worming throughout the year, but your veterinary surgeon will be best placed to recommend an appropriate schedule.

When choosing products, it is important to use a treatment that is suitable for your cat’s age and weight, and to follow the instructions carefully. If your cat needs a prescription-only medicine, you can read more about how to order a prescription medicine through Vetscriptions, or visit our prescription FAQs for further guidance.

Choosing the right worming treatment

Worming treatments come in different forms, including tablets, spot-on treatments, and prescription products. Not every wormer covers every type of parasite, so it is worth checking what protection a product offers before using it.

When selecting a wormer, think about:

• Your cat’s age and body weight
• Whether your cat goes outdoors
• Whether your cat hunts
• Whether there is a known flea problem in the home
• Any existing health conditions or other medications

If you are unsure which product may be suitable, it is always sensible to ask your veterinary surgeon. You can also browse our wider cat collection for everyday healthcare support, including cat supplements and other cat care essentials.

Preventing worms in cats

Good parasite control is about more than just giving a worming treatment now and then. A few simple habits can help reduce your cat’s risk of reinfection.

• Use regular worming treatment as advised by your veterinary surgeon
• Keep flea control up to date, as fleas can spread tapeworms
• Empty and clean litter trays regularly
• Wash bedding routinely
• Dispose of faeces promptly where possible
• Discourage hunting if practical, although we know this is not always easy with cats
• Maintain good household hygiene, including hand washing after cleaning litter trays

If your cat is prone to digestive upset or you are supporting their overall wellbeing alongside preventative care, you may also find our cat digestion products helpful, depending on your veterinary surgeon’s advice.

Can humans catch worms from cats?

Some intestinal worms carried by cats can, in rare cases, affect people. This is one reason why regular worming and good hygiene are strongly advised. Children should be encouraged to wash their hands after playing with pets or outdoor soil, and litter trays should be cleaned carefully.

While the risk to most healthy adults is low with sensible hygiene measures, prevention remains the best approach.

When to speak to your veterinary surgeon

You should contact your veterinary surgeon if:

• You think your cat may have worms
• Your cat has vomiting, diarrhoea, weight loss, or a pot belly
• You have a young kitten with digestive symptoms
• Your cat keeps getting fleas or tapeworms
• A worming product does not seem to be working
• You need help choosing a suitable and responsible treatment plan

In some cases, your vet may recommend a faecal test, a specific prescription wormer, or a broader parasite control plan.

Supporting your cat’s health with confidence

Worms are unpleasant, but they are also a routine part of cat healthcare that can usually be managed well with the right preventative approach. Knowing the symptoms, keeping up with regular treatment, and acting early if something does not seem right can make a real difference to your cat’s comfort and wellbeing.

At Vetscriptions, we are here to help UK pet owners access trusted pet healthcare products and prescribed medications responsibly. You can explore our cat flea, tick and worming range, browse our cat collection, or learn more about us. If your cat is showing symptoms or you are unsure which treatment is appropriate, please speak to your veterinary surgeon for personalised advice.

If you need help with ordering or prescriptions, you can also visit our contact page. We are always pleased to support you in making informed, responsible choices for your pet’s health.