I. Reasons for severe tear stains in cats
1. Improper diet is the main reason for severe tear stains in cats. Because cats have very sensitive stomachs, if their daily diet is very strong in flavor or they often eat human food, they are prone to allergic symptoms, and the tear stains will naturally become severe.
2. Some cats also have severe tear stains due to primary hyperlacrimation, which is also a congenital condition.
3. Eye diseases are also a major cause of severe tear stains in cats, such as nasolacrimal duct obstruction, dacryocystitis, or entropion. These diseases cause the cat's tears to flow continuously from the corner of its eyes, which over time will result in severe tear stains.
4. If a cat's eyelashes grow inwards, they can easily irritate its eyes, causing it to tear up constantly, which will naturally lead to severe tear stains. 
II. How to prevent tear stains
1. Ensure your cat's diet is bland. Do not feed it human food or give it snacks frequently. Be careful when choosing cat food and avoid products that are likely to cause internal heat.
2. Owners can frequently use pet facial cleaning wipes to clean their cat's eyes and keep them healthy. However, do not use tap water to wash around the cat's eyes directly, as tap water contains many bacteria and may cause infection.
3. Cats with long fur need regular grooming to clean the fur around their eyes and prevent eyelashes from ingrown and irritating their eyes.
III. How to remove tear stains
Once tear stains appear on a cat, they are difficult to remove quickly. Owners need to clean the cat's eyes frequently, and for cats with severe tear stains, professional tear stain removal products may be necessary. Generally, you should first remove oxidized fur and pay close attention to the cat's eye care routine. Gradually, the tear stains will disappear.
Tear stains on cats can significantly affect their appearance. While they are difficult to remove, with persistent effort from the owner, it's always possible to help your cat regain their beauty. If you have any further questions, you can also consult an online veterinarian.
