There are several reasons why a cat's eyes may be closed and watery. Here are some possible causes:
1. Foreign body irritation: A cat's eyes may be irritated by foreign objects such as hair, ingrown eyelashes, or shampoo after bathing, causing redness and tearing.
2. Infection: A cat's eyes may be infected with bacteria, viruses, or other microorganisms, such as feline herpesvirus, which can cause eye pain, redness, swelling, and tearing.
3. Eye inflammation: such as conjunctivitis, a common eye problem in cats, is usually caused by bacterial infection and is accompanied by eye pain and redness, and may also have discharge.
4. Heatiness: An unbalanced diet, such as food that is too strong in flavor or frequently eating human food, may cause heatiness in cats, which can lead to tearing.
5. Eyelash problems: Overly long or ingrown eyelashes in cats can irritate the eyes and cause tearing. Severe eyelash problems may require surgical treatment.
6. Corneal damage: Cats may exhibit symptoms such as tearing, photophobia, inability to open their eyes, cloudy eye surface, and redness and swelling of the fundus. In this case, it is necessary to take the cat to a veterinary hospital for corneal fluorescein staining to observe the damage and to use anti-inflammatory and corneal repair eye drops as directed by the veterinarian.
7. Other diseases: Some diseases, such as feline leukemia virus and feline coronavirus, can also cause eye diseases in cats.
