The reasons why cats have no appetite and won’t eat:

1. Cat dental problems

Cat periodontal disease, or gum disease, can cause bad breath in pets , but the long-term effects may be more severe. If left untreated, periodontal disease can lead to infection, pain, and tooth loss. These will affect the cat's ability to eat or appetite.

2. Cat gastrointestinal problems

There are many gastrointestinal problems that may cause a cat’s lack of appetite, including intestinal parasites, colitis and gastroenteritis. Any of these conditions may lead to inflammation of the gastrointestinal tract and may also produce symptoms such as nausea, vomiting, and diarrhea.

3. Feline pancreatitis

Cat pancreatitis is also a common cause of lack of appetite and can lead to lethargy, dehydration and weight loss. If left untreated, pancreatitis can not only cause a loss of appetite but also difficulty breathing, sepsis, and even bleeding. Prompt treatment is required to prevent the condition from worsening and becoming fatal.

4. Intestinal obstruction in cats

Sometimes cats swallow things they shouldn’t, and these things can cause intestinal blockage or obstruction. When this happens, he will experience abdominal pain or cramps that keep him away from food. Other symptoms of intestinal obstruction in cats may include fluid accumulation, vomiting, dehydration, fatigue, and weight loss.

5. Cat kidney disease

Kidney disease can cause cats to stop eating. While there is no cure for chronic kidney disease, there are treatments that can resolve symptoms and help cats start eating again.

6. Adverse reactions in cats

If the cat suddenly stops eating after being vaccinated, it may be a side effect. Loss of appetite due to vaccination is usually mild and transient.

7. Changes in the cat’s lifestyle

If the cat suddenly stops eating, it may be that the cat’s lifestyle has changed. Maybe someone has moved away or a new pet has arrived. Such things can trigger negative psychological reactions in some cats, leading to a loss of appetite. Many cats also lose their appetite if they find themselves in an unfamiliar environment.

8. Changed to new cat food

Many cats have sensitive digestive systems, and even small changes in diet can cause digestive discomfort and lead to loss of appetite.