Brown discharge from the corners of a cat's eyes may be caused by a variety of reasons, including but not limited to eye infection, foreign body irritation, dietary problems or other diseases. The following are some possible causes and their corresponding treatments: 1. Eye infection: If there is obvious redness and swelling at the corners of the cat's eyes, increased secretions or a peculiar smell, it may be a sign of eye infection. In this case, prompt medical attention should be sought so that a veterinarian can confirm the diagnosis and administer appropriate antibiotic treatment. 2. Foreign body irritation: If the cat comes into contact with foreign bodies that may cause eye discomfort, such as dust, bacteria, etc., brown secretions may appear. At this time, you should check the cat's eyes, remove foreign objects in time, and wipe them with a clean towel. You can also use pet-specific eye cleaning products to help clean them.

3. Dietary issues: If the cat's food is too greasy or hot, it may irritate the eyes and produce brown discharge. The cat’s diet should be adjusted, choose light and easy-to-digest food, and pay attention to the nutritional balance of the food.

4. Other diseases: Certain diseases, such as cat nasal congestion, conjunctivitis, etc., may also cause brown discharge from the corners of the cat’s eyes. If the cat has other symptoms besides eye problems, such as sneezing, runny nose, poor appetite, etc., it should seek medical attention in time for examination.