Your cat's eyes may be watering due to several common causes such as allergies, conjunctivitis (pink eye), corneal ulcers or injuries, upper respiratory infections, blocked tear ducts, eyelid abnormalities, or foreign bodies in the eye. Allergies to environmental factors like pollen, dust, or household cleaners can cause itchy, watery eyes. Conjunctivitis, an inflammation of the eye membrane, often leads to redness, swelling, and discharge. Eye injuries, infections, or respiratory illnesses can also cause watery eyes. Additionally, certain breeds with facial structure differences are more prone to blocked tear ducts causing tear overflow. If the watering persists or is accompanied by other symptoms like redness, swelling, squinting, or discharge, veterinary attention is recommended to diagnose and treat the underlying cause promptly.