Can Cats Cause Styes? What the Science Says

Styes are a common eye condition. While cats do not directly cause styes, understanding how bacteria spread can clarify the connection.

Understanding Styes

A stye is a red, tender bump that forms on the edge of the eyelid, often resembling a pimple. This condition arises when a small oil gland or a hair follicle at the base of an eyelash becomes blocked and subsequently infected. Common symptoms include localized pain, swelling of the eyelid, redness, and sometimes a feeling that something is in the eye. The primary cause of styes is typically a bacterial infection, most often by Staphylococcus aureus.

The Cat Connection

Cats do not carry a unique type of bacteria that specifically causes styes in humans. However, cats, like humans, can carry common bacteria such as Staphylococcus aureus. These bacteria are widespread in the environment and are a normal part of the skin flora for both people and animals.

Transmission of these bacteria from a cat to a human’s eye is an indirect route. If someone interacts with a cat, such as petting or being licked, and then touches their eyes without prior handwashing, bacteria could potentially transfer. This transfer is not unique to cats; any surface or object contaminated with these common bacteria could pose a similar, albeit low, risk if hygiene practices are not followed.

Preventing Styes and Promoting Eye Health

Preventing styes largely involves maintaining good hygiene practices, regardless of pet ownership. Frequent handwashing with soap and water, particularly before touching the face or eyes, is important. Avoid rubbing or touching the eyes unnecessarily, as this can introduce bacteria. For those who wear contact lenses, proper hygiene including thorough cleaning and disinfection is recommended. Removing eye makeup completely before sleep and replacing old cosmetics regularly can also help prevent blockages and bacterial growth.

When to Seek Medical Attention

Many styes resolve on their own within a week or two with simple home care. Applying a warm, moist compress to the affected eyelid for 5 to 10 minutes, several times a day, can help reduce swelling and encourage drainage. It is important not to squeeze or try to pop a stye, as this can spread the infection or cause further complications.

A healthcare professional should be consulted if a stye does not show signs of improvement after 48 hours to a few days of home treatment. Medical attention is also warranted if the stye worsens, the pain or swelling increases significantly, the entire eyelid becomes red and swollen, or if vision is affected. Additional signs like blistering on the eyelid, fever, or chills also indicate a need for professional evaluation.