Cat tear stains are reddish-brown
1. Reddish-brown tear stains in cats can be caused by a variety of reasons.
2. Excessive tear production leading to tear duct blockage is a common cause, while factors such as diet, environment, and facial structure may also affect tear production.
3. If your cat exhibits these symptoms, it is recommended to take it to a veterinarian for a comprehensive examination to determine the specific cause. 
4. The veterinarian will examine the cat's eyes and the area around them to assess its health and develop a treatment plan.
5. Before seeing a veterinarian, owners can try the following measures to alleviate their cat's tear stains:
a. Choose low-iron cat food to reduce tear color depth and supplement with vitamin A to enhance tear gland function.
b. Clean around your cat's eyes daily to prevent tear buildup.
c. Trim the hair around the eyes appropriately to prevent tears from staining the hair.
6. In summary, for the problem of tear stains in cats, owners should actively seek the help of a veterinarian and take appropriate care measures to avoid unnecessary trouble and disease.