TL;DR: Swelling under a cat's eye is most often caused by a dental abscess or infection and typically requires veterinary care within 24 to 48 hours.
What causes the swelling under my cat's eye?
- Carnassial tooth root abscess: An infection at the root of the upper fourth premolar that creates a pocket of fluid.
- Bite wounds or scratches: Localized abscesses caused by external trauma.
- Allergic reactions: Swelling resulting from insect stings.
- Other causes: Blocked nasolacrimal ducts, cysts, or tumors.
Is swelling under my cat's eye a medical emergency?
- Urgency level: Medium. It is not usually life-threatening but indicates significant pain and active infection.
- Recommended timeline: Schedule a veterinary appointment within 24 to 48 hours.
- Emergency signs: Seek same-day care if your cat has a high fever, extreme lethargy, or if the eye looks cloudy or is being pushed closed.
How can a photo help my veterinarian triage the swelling?
- Visual assessment: Provides clear detail on the proximity to the eye and identifies any drainage or broken skin.
- Progress tracking: Serves as a vital baseline to determine how rapidly the swelling is progressing.
- Case prioritization: Helps the veterinary team prioritize your cat’s case during the triage process.
Clinical Context (Merck Veterinary Manual)
In cats, swelling under the eye can be caused by traumatic proptosis, where the globe is luxated from the orbit following blunt trauma, with secondary orbital hemorrhage and swelling further displacing the globe. Ocular neoplasia, although less frequent in cats than in dogs, can also manifest as swelling, with eyelid and conjunctival tumors being the most frequent primary ophthalmic neoplasms, often malignant such as squamous cell carcinomas. Ophthalmic emergencies require rapid diagnosis and aggressive therapy.
Chapter: Ophthalmology, Emergency
Source: The Merck Veterinary Manual, 11th Edition (Page 504)