What to do if a cat’s eye keeps tearing up?

Tearing in just one eye may be caused by foreign-body irritation, for example overly long fur around the eye irritating the conjunctiva, or hair, dust, or flying insects in the air falling into the eye. It is recommended to rinse the eye with saline solution or a pet eye-cleaning solution, then apply a pet antibacterial eye drop to prevent infection.

In addition, bacterial or viral infection can also cause one-eye tearing. If you observe symptoms such as runny nose and sneezing, consider causes like herpesvirus or calicivirus infection, and promptly take the cat to a veterinary hospital. If the cat has no other symptoms, you can first treat with neomycin sulfate eye drops, and remember to clean the eye discharge daily.