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Conjunctivitis In Cats – Causes, Signs & Care Tips

Written by: Christian Adams

Last Updated on January 12, 2024 by Catster Editorial Team

cat with irratated eye

Conjunctivitis In Cats – Causes, Signs & Care Tips


Dr. Lorna Whittemore Photo


Dr. Lorna Whittemore


The information is current and up-to-date in accordance with the latest veterinarian research.

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Conjunctivitis is a common illness that can affect a cat’s eyes. It has some easily recognizable signs and is fortunately treatable, but it’s vital for owners to be familiar with the condition. If conjunctivitis is suspected, owners must take their cat to the vet to be treated quickly; the condition can be infectious and spread to other cats (or even people). This article will examine conjunctivitis in cats, including what signs to look out for and what can potentially cause the irritating and painful eye condition.

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What Is Conjunctivitis?

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Conjunctivitis (or pink eye) is a condition that affects the tissue surrounding the eye called the conjunctiva. Conjunctivitis can affect either one or both eyes, and it causes signs that are usually fairly obvious to most owners. There are two types of conjunctivitis with different causes: infectious and non-infectious. Both infectious and non-infectious conjunctivitis can cause physical and behavioral signs, but it’s important to observe your cat closely as they’re often good at hiding illness.

Conjunctivitis is inflammation that affects the mucous membrane lining of the eyelid and extends to the edge of the cornea. This lining is similar to the lining in your cat’s mouth and nose. It is the most common eye condition in cats; most cats will get conjunctivitis at least once in their lives. Conjunctivitis can also be a secondary sign in other feline eye conditions.

What Are the Signs of Conjunctivitis?

Cat with eye infection
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There are several telltale signs of conjunctivitis in cats, both physical and behavioral. Signs that your cat might have conjunctivitis include:

  • Reddened eyelids and rims of the eyes
  • Pawing at the eye and shaking the head, irritability
  • Watering eyes or tears from one or both eyes, either normal clear tears or discolored
  • A discharge that can be cloudy, yellow, or green, and it can be watery or thick
  • Squinting or holding the eyes closed
  • Severe cases can cause a cat’s third eyelid or conjunctiva tissue to swell and either partially or fully cover the eye

What Are the Causes of Conjunctivitis?

Conjunctivitis has a few causes, which can be grouped into infectious and non-infectious causes:

Infectious Causes

cleaning persian chinchilla cat's eyes with cotton pad
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Pathogens cause infectious conjunctivitis. Pathogens are microorganisms that cause disease and are the most common cause of feline conjunctivitis. Pathogens include viruses, bacteria, and fungi, all of which can cause conjunctivitis. Common viral causes of the illness include feline Herpesvirus and feline Calicivirus, which can cause inflammation in conjunctivitis. Chlamydophila and Mycoplasma are common causes of primary bacterial conjunctivitis in cats. Other pathogens, like the bacteria Streptococcus, can take over and cause infection, particularly if a cat is immunocompromised, such as in cats with FIV (feline immunodeficiency virus).

Infectious conjunctivitis is also contagious; it can spread between a single cat’s eyes and can also be spread to other animals.

Non-Infectious Causes

Anything that can irritate the eyes can cause conjunctivitis in cats. Common non-infectious causes of feline conjunctivitis include:

  • Ectropion: A condition in which the eyelashes grow inward and rub on the eyeball due to turned-in eyelids. More common in long-haired breeds such as Persians.
  • Allergies: Allergic conjunctivitis can be difficult to treat as the key to treatment is identifying the trigger.
  • Foreign bodies: Objects that should not be in the body getting into the eye, like sand, grit, or dirt.
  • Tumors: Tumors or growths can irritate the eyes and lead to conjunctivitis.
  • Ulcers of the cornea: They are often caused by injury to the eye, such as a cat scratch.
Woman cleans a cat's eyes
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How Do I Care for a Cat With Conjunctivitis?

The main aims of treatment and care for a cat with conjunctivitis are to alleviate pain and reduce inflammation. In any case, conjunctivitis will need to be treated at a veterinarian’s office, so taking them to the vet is your priority. The vet will examine the cat’s eyes and often give them medications to help reduce pain and soothe any irritation or swelling.

Medications can be applied to the eye, including antibiotics if your vet suspects infectious conjunctivitis and lubricating ointment. Anti-inflammatories can also be prescribed to help reduce pain and swelling. Medication for conjunctivitis can be in the form of eye drops or ointments squeezed into the eye.

The main things owners can do at home are to remain calm and give their cats lots of TLC. Providing any treatments your veterinary surgeon prescribes for your cat is integral to their care, as medication applications can be as frequent as three to six times per day. Your vet will carefully talk you through all medications and their application.

We do not recommend using any other treatment other than those your vet prescribes. You may need some help from a friend your cat trusts or a family member to help you administer eye medication. Remember to always finish any courses of medicine exactly to your vet’s instruction. If there is an underlying problem, you should work with your vet to treat the underlying cause as soon as possible.3 cat face divider

Frequently Asked Questions (FAQs)

Is Conjunctivitis Contagious?

Yes, Conjunctivitis is often contagious and can be highly infectious in certain situations. For example, conjunctivitis caused by feline Herpesvirus is very easily spread to other cats in close contact situations, such as in animal sanctuaries or multi-cat households. Conjunctivitis can be spread through coughs, sneezes, saliva, and other bodily fluid coming into contact with a cat’s eyes. It is commonly spread between cats as they often groom each other and are physically close when bonded. However, causes of conjunctivitis that aren’t infectious cannot be spread.

Can People Get Conjunctivitis From Cats?

Yes, people can get conjunctivitis from cats, but it is very rare. A few causes of conjunctivitis can cross the species barrier, such as Chlamydophila felis. However, conjunctivitis only usually occurs cross-species this way in immunocompromised people, such as people with autoimmune diseases.

Other infectious cases of conjunctivitis can be passed to people via parasites. These cases are also rare and would cause other signs as well as conjunctivitis. Frequent hand washing and cleaning the bowls, litter trays, bedding, and anything else a contagious cat comes into contact with will reduce the spread. Make sure your cat is not sharing any of their resources with other cats in the home if they have conjunctivitis.

vet checking cat's eyes
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How Is Conjunctivitis Diagnosed in Cats?

Veterinary diagnosis is essential in conjunctivitis as there are several eye conditions that can cause similar signs. Your vet will likely do a complete ophthalmic exam and examine all aspects of your cat’s eye when you take them into the clinic. Other diagnostic tools can include:

  • Using a Schirmer tear test that tests your cat’s tear production
  • Looking at your cat’s eye under a light
  • Using fluorescein staining to look for any ulcers on the cornea
  • Eye pressure tests

An injury or ulcer on the eye will glow green under black light. Sometimes a vet might order further tests, such as blood tests, to check for any underlying causes of disease. In addition, they may try to isolate the bacteria or infection type causing conjunctivitis, meaning that specific tests for certain bacteria and viruses may be ordered.

Cat with eye infection
Image Credit: KAY4YK, Shutterstock

How Long Is the Recovery Period?

Recovery times for conjunctivitis depend on the cause. In typical cases of conjunctivitis, you can expect a cat to recover within a week to 10 days. Sometimes conjunctivitis won’t be easily treated, so extra courses of antibiotics or treatment might be needed, increasing the recovery time.

Some cases of conjunctivitis in cats can reoccur, such in cats with feline Herpesvirus. Cats may need surgery in extreme cases or if the conjunctivitis was caused by an eye injury, meaning that healing time from the surgery and recuperation times will be longer.3 cat face divider


Conjunctivitis in cats has specific signs owners can look out for, which include inflammation and swelling of the eye. Conjunctivitis can be infectious and can spread to other cats. Different types of conjunctivitis, such as foreign bodies in the eye or tumors, are not contagious and cannot be caught by other cats or people. Veterinary treatment is always needed in cases of conjunctivitis, as the eyes are delicate organs that can quickly become damaged. If not treated, conjunctivitis can cause long-lasting eye problems, but most issues are resolved within 10 days. If in doubt, always take your cat to the vet. We hope this article has clued you in on the common signs of conjunctivitis so you can be alert and take care of your cat if needed.

Featured Image Credit: Sheila Fitzgerald, Shutterstock

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