A cat's vomiting after eating cat food can be caused by a variety of reasons:
1. Cats eat too fast, and the food irritates their throat or stomach, causing them to vomit.
2: The taste, ingredients, or texture of the cat food are not suitable for the cat, causing indigestion.
3: Cats may vomit due to weak gastrointestinal function or food intolerance.
4. When a cat has gastroenteritis, food irritates the gastrointestinal mucosa, causing vomiting.

5. When a cat licks its fur, the fur can enter its stomach and form a hairball, which can affect food digestion and cause vomiting.
6. Internal parasites such as roundworms and hookworms can affect a cat's digestive function and cause vomiting.
7. Kittens that have not completed their vaccinations may vomit due to infectious diseases such as feline panleukopenia.
To address the above issues, pet owners should observe their cat's symptoms, adjust the cat's eating speed and type of cat food, deworm regularly, and maintain the cat's health.