Disorders of the Nasal Cavity and Tear Ducts in Cats

Occasionally cats will experience a chronic overflow of tears due to an obstruction of the nasal duct called epiphora. This is more common in Persian and Himalayan breeds. In most cases, there is no reason for concern when this occurs, as it does not lead to any medical problems. However, if appearance is an issue, the condition can be corrected surgically.

Inflammation of the tear sac is rare in cats. It is usually caused by obstruction of the tear sac and the attached nasolacrimal tear duct by inflammatory debris, foreign objects, or masses pressing on the duct. It results in watering eyes, conjunctivitis that is resistant to treatment, and occasionally a draining opening in the middle of the lower eyelid. If your veterinarian suspects an obstruction of the duct, he or she may attempt to unblock it by flushing it with sterile water or a saline solution. X‑rays of the skull after injection of a dye into the duct may be necessary to determine the site, cause, and outlook of longterm obstructions. The usual therapy consists of keeping the duct unblocked and using eyedrops containing antibiotics. When the tear duct has been irreversibly damaged, surgery may be necessary to create a new drainage pathway to empty tears into the nasal cavity, sinus, or mouth.

The condition known as dry eye results from inadequate tear production. It often causes persistent mucus and pus-filled conjunctivitis and slow-healing sores (ulcers) and scarring on the cornea. Dry eye is not common in cats but has been associated with longterm feline herpesvirus-1 infections. Topical therapy consists of artificial tear solutions, ointments, and, if there are no scars on the cornea, medications that contain steroids. In longterm dry eye resistant to medical therapy, surgery may be required to correct the condition.