Redness in the cat's eye circles may be caused by foreign matter, allergies, improper diet, eye inflammation, bacterial infection, etc. You need to check whether there is any foreign matter in the cat's eyes. If there is any foreign matter, flush it with saline in time. If the situation is If it is not serious, you can give the cat anti-inflammatory eye drops, adjust the cat's diet at the same time, and let the cat drink more water. If the situation is serious, it is best to take the cat to the pet hospital for examination and treatment.