If your cat has been scratching more than usual, you might be wondering what’s causing it.

Occasional grooming is normal, but persistent itching can be a sign that something isn’t right.

One of the most common causes is parasites, particularly fleas. However, other issues such as skin infections or stress-related overgrooming can also lead to itchy skin. 

Understanding the possible causes can help you decide when to seek advice and how to keep your cat comfortable.

In this guide

What causes itching in cats

What parasites are and how they affect cats

Common parasites in cats

Signs of parasites in cats

How cats catch parasites

Why parasites are more common in spring

Treatment and prevention

When to contact a vet

FAQs

What causes itching in cats?

The most common causes of itching in cats include:

• fleas
• skin infections, such as ringworm
• overgrooming linked to stress
• allergies

Parasites are the most likely cause in many cases, particularly fleas. However, skin infections and other conditions can also cause similar symptoms, so it’s important not to assume the cause without checking.

What are parasites and how do they affect cats?

Parasites are organisms that live on or inside another animal. In cats, they can cause discomfort, illness and irritation.

External parasites, such as fleas or mites, live on the skin and fur and are a common cause of itching. In some cases, they can lead to more serious problems. For example, heavy flea infestations can cause anaemia in kittens and just one flea bite could trigger an allergic skin reaction.

Internal parasites, such as worms, live inside the body and affect cats differently. They don’t usually cause itching, but can lead to symptoms such as vomiting, diarrhoea and weight loss.

Common parasites in cats

The most common parasites affecting cats in the UK include:

• fleas
• ticks
• mites (including ear mites)
• lice
• worms (such as roundworms and tapeworms)

Fleas are by far the most common and are the main parasite linked to itchy skin. Ear mites can also cause irritation, particularly around the ears.

You can find more information about these little parasites and how they affect cats in our dedicated advice pages.

Signs of parasites in cats

The signs of parasites can vary depending on the type, but common symptoms include:

• frequent scratching or overgrooming
• patches of hair loss
• scabs or irritated skin
• visible fleas or flea dirt in the fur or bedding
• itchy or dirty ears
• worms visible in faeces or around the back end
• digestive upset, such as vomiting or diarrhoea

You may also notice early signs such as your cat grooming more than usual or small areas where the fur appears thinner.

Seeing fleas, flea dirt or small rice-like segments (which may indicate tapeworm) can strongly suggest a parasite problem.

As cats can pick up parasites in a range of ways, including from their environment, this is something to consider if your cat is showing signs of skin problems.

How do cats catch parasites?

Cats can pick up parasites in several ways, including:

• contact with other animals
• exposure to contaminated environments
• catching and eating prey
• shared bedding

Fleas can also live in carpets and soft furnishings, meaning they can persist in the home. In some cases, they may even be brought inside on clothing.

This means that even indoor cats can be affected. As we explain in our guide to pesky parasites, it’s a common misconception that only outdoor cats are at risk.

Why are parasites more common in spring?

Parasites, particularly fleas, thrive in warmer conditions. Spring and summer provide ideal environments for them to reproduce and spread more quickly.

However, centrally heated homes mean fleas can survive indoors throughout the year, so parasite infections are still possible during colder months.

You may notice an increase in scratching as the weather becomes warmer, which can be a sign that parasite activity is increasing.

How are parasites in cats treated?

Treatment will depend on the type of parasite involved, so it’s important to get the right diagnosis.

Your vet may prescribe:

• topical treatments (spot-on products)
• tablets
• injections

Flea infestations often require more than one treatment, and it’s important to treat both your cat and their environment. This may include washing bedding at high temperatures and using a vet-recommended household spray.

It’s always best to seek veterinary advice. Many non-prescription products may not be effective, as they may not contain enough active ingredient to fully treat the problem.

How to prevent parasites in cats

Preventing parasites is much easier than treating an infestation.

The most effective approach is regular preventative treatment recommended by your vet. This usually includes:

• monthly flea treatment
• regular worming (typically every one to three months, depending on your cat’s lifestyle)

Even indoor cats can benefit from protection, as parasites can still enter the home.

Maintaining a clean environment can also help, including regular vacuuming and washing bedding. Keeping up with parasite control is key to reducing risk.

Can humans get parasites from cats?

Some parasites can affect humans.

Fleas can bite people, causing itching and irritation. In some cases, this can be more problematic for children or people with weakened immune systems.

Certain worms can also be passed to humans, although this is less common. A condition called toxocariasis can occur if worm eggs are accidentally ingested, though most cases do not lead to illness.

Good hygiene can help reduce risk, including:

• washing hands regularly
• cleaning litter trays daily
• vacuuming frequently
• keeping up with preventative treatments

When should I contact a vet about an itchy cat?

You should contact a vet if:

• your cat’s itching continues for more than a few days
• your cat seems uncomfortable or unwell
• you notice head shaking or ear scratching
• the skin becomes sore or starts to bleed
• you see patches of hair loss

Seek urgent advice if you notice:

• bleeding or broken skin
• hot, swollen or red areas
• signs of pain around the ears
• diarrhoea or other signs of illness

Trying to treat the problem yourself without the right diagnosis can delay effective treatment. If you’re unsure, it’s always best to seek veterinary advice.

A final word from our veterinary team

If your cat is itching more than usual, the most important step is to speak to your vet. Trying home remedies or unsuitable treatments may not resolve the issue and could make it worse.

FAQs

What are the symptoms of parasites in cats?

Common symptoms include scratching, hair loss, scabs, visible fleas, dirty ears and digestive issues such as vomiting or diarrhoea.

How can you get rid of parasites in a cat?

Parasites should be treated with vet-recommended products. The correct treatment depends on the type of parasite, so it’s important to get advice from your vet.

Can indoor cats get parasites?

Yes, parasites such as fleas can be brought into the home on clothing or by other animals.

Do parasites always cause itching in cats?

No, external parasites like fleas and mites cause itching, but internal parasites such as worms usually affect digestion instead.