Diseases of the upper respiratory tract can cause discharge to clog the nose and eyes of your cat, which can result in a temporary loss of sight or restriction of scent.
These respiratory problems could be brought on by bacterial or viral illnesses that just need simple treatment, but on the other hand, they could be as serious as cancer.
A cat's inability to eat could be the result of a problem with its stomach, intestines, pancreas, or another component of its digestive system.
But in most cases, a loss of appetite will be one of the first symptoms that something is wrong with the digestive system.
The condition known as gastrointestinal obstruction, or GI obstruction, occurs when a foreign body becomes lodged in the digestive track of an animal such as your cat.
The inability of food to move through the digestive tract when there is an obstruction in the GI tract might cause your cat to throw up, and he or she may also stop eating.
It's possible for cats to suffer from a variety of painful dental conditions, including dental abscesses, dental fractures, resorptive lesions on their teeth.
On the other hand, dental problems in cats can be difficult to identify, and your veterinarian may need to sedate or anesthetize your pet in order to examine the issue properly.
If the manufacturers of cat food change the flavors and ingredients without providing any clear indication.
On the label, your cat may become aware of the change and abruptly refuse to eat the food.
If you offer your cat food that has gone bad or has expired, they might not want to eat it.
Check the date that is printed on the food for its validity. Or, at the absolute least, give it a whiff to check whether it has an unpleasant odor.