Persian cats may shed tears because the cat food is too salty and oily. If the cat takes in too much salt, the cat will have more tears and the tear stains will be aggravated, which not only affects the appearance but also causes eye diseases; illness: general bacteria Infection, foreign body irritation, allergies and trauma can all lead to feline conjunctivitis; breed factors: Persian cats have shorter muzzles, and their flat faces are more likely to shed tears.

Cat tears may be caused by cat food that is too salty or oily. Cats hardly perspire, so their salt consumption is very small. The amount of salt that humans need per day is about 5g, and the amount of salt that cats need is 8% of humans, so cats only need about 0.4g per day. If the cat consumes too much salt, the cat will shed more tears and aggravate the tear stains, which will not only affect the appearance but also cause eye diseases.

Cats will have a "stress reaction" when they suddenly change to a new environment after adapting to the original environment. After moving, cats may hide in corners, howl, urinate everywhere, have rapid heartbeats, and increase respiratory rates. Diseases break out under the stimulation of stress reactions, such as colds, respiratory infections, corneas, conjunctivitis, etc. Because the stress response occurs, the body's immunity will decrease, blood pressure will increase, and tears will flow.

General bacterial infection, foreign body irritation, allergies and trauma can cause feline conjunctivitis. If you open the cat's eyelids and see red, swollen and swollen conjunctiva, the cat may have conjunctivitis. At this time, the cat's eyes will appear sneezing, "squinting", tearing, itching, photophobia, etc. If not treated in time, complications such as conjunctival edema and corneal ulceration may occur. Feline conjunctivitis is not contagious to humans, but it can be contagious to other cats in the home.

Some breeds of cats are born to shed tears more easily than other cats due to genetic factors, resulting in yellowing tear marks. For example, cats with flat faces are more likely to shed tears because their tears are more likely to overflow their eye circles, such as Garfield cats, Persian cats, and fold-eared cats. These cats also have shorter lacrimal nasopharyngeal ducts than other cats and are more likely to produce tears.