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Conjunctivitis in Cats

Conjunctivitis in cats (cat pink eye or feline conjunctivitis) is one of those conditions that looks simple at first but can be many different things depending on the cause. It is very common in cats of all ages, especially kittens and cats living in multi-cat homes, shelters, or catteries.

While conjunctivitis sometimes is not serious, it should never be ignored. In some cats it is a mild, short-term irritation, but in others it can be the first visible sign of a more serious infectious or immune-related condition. Understanding what conjunctivitis is in cats, and how to approach treatment safely, is very important to protect your kitty’s comfort and long-term eye health.

What Is Conjunctivitis in Cats?

Conjunctivitis refers to inflammation of the conjunctiva, the thin, moist tissue that lines the inside of the eyelids and covers part of the surface of their eyes. This tissue helps keep the eye lubricated and acts as an important barrier against bacteria, viruses, dust, and irritants.

When the conjunctiva becomes inflamed, it swells and can turn red or pink, which is why the condition is often called ‘cat pink eye.” The eye may also start producing excess tears or discharge as the body tries to protect it.

Conjunctivitis in Cats Symptoms

  • Red or pink eyes
  • Squinting or frequent blinking
  • Watery eyes or thicker discharge
  • Crusting around the eyelids
  • Your cat rubbing their face or pawing at the eye
  • Sensitivity to light

Some cats show discomfort clearly, while other cats can act almost normal despite visible eye changes. Remember that cats are very good at hiding pain, so even small signs matter.

Pet owners may also notice:

  • Redness of one or both eyes
  • Swollen inner eyelids
  • Clear, yellow, or green discharge
  • Tear staining
  • Squinting or holding the eye partially closed

Infectious Causes

Infectious agents can be by far the most common cause of cat conjunctivitis, especially in younger cats. For example:

  • Feline herpesvirus-1
  • Chlamydia
  • Mycoplasma species
  • Secondary to bacterial infections or following viral disease

Is conjunctivitis contagious in cats? Definitively! If conjunctivitis is caused by infection, it can be quite contagious, particularly in shared environments.

Non-Infectious Causes

Not all red or pink eyes in cats are caused by infections. For instance:

  • Allergies
  • Dust, smoke, or chemical irritants
  • Foreign material in the eye
  • Trauma
  • Dry eye or tear film imbalance
  • Chronic eyelid or corneal issues

One Eye vs. Both Eyes

  • One eye affected can suggest trauma, foreign material, or early infection
  • Both eyes affected is more commonly caused by viral disease, allergies, or systemic conditions

It is important to note that this distinction can be helpful, but it is not diagnostic.

How Veterinarians Diagnose Conjunctivitis

Diagnosis usually starts with an eye examination. Your veterinarian may:

  • Examine the eye structures
  • Use fluorescein, a type of dye, to rule out corneal ulcers
  • Assess the tear production
  • Recommend testing for infectious diseases

Conjunctivitis in Cat Treatment Options

The steps on how to treat cat conjunctivitis in cats depend on the underlying cause. Veterinary treatment may include:

  • Topical antibiotic such as eye drops or ointments
  • Antiviral support for herpesvirus for example
  • Anti-inflammatory medications
  • Drop lubricants for the eye

Note: Never use human eye drops or leftover medications from another pet. Some products, especially steroid eye drops, can be extremely dangerous if the cornea is damaged.