There are many conditions that can cause watery eye discharge in cats:
- Feline pneumonitis (Chlamydophila felis infection). Signs may range from watery to mucous- and pus-filled inflammation of the conjunctiva and mucous membranes of the nose.
- Eyeworm disease (thelaziasis). Signs may include excessive watering of the eyes, inflammation of the conjunctiva, and slow-healing sores.
- Blockage of the nasal duct (epiphora). Chronic overflow of tears due to an obstruction of the nasal duct is common in Persian and Himalayan breeds.
- Feline infectious peritonitis
- Acute bacterial and viral respiratory infections
- Feline viral rhinotracheitis
- Chronic nasal irritation
- Feline herpes virus infection
- Allergic reactions to environmental irritants
- Debra Eldredge, Delbert G. Carlson, Liisa D. Carlson, Beth Adelman, James M. Giffin. Cat owner's home veterinary handbook
- E. A. Chandler, R. M. Gaskell, C. J. Gaskell. Feline Medicine and Therapeutics
- Merck/Merial Manual for Pet Health (Home Edition)
- Chlamydophila felis in Cats - Are the Stray Cats Dangerous Source of Infection?M. Halanova1 et al.