The reasons why a cat vomits and refuses to eat for three days:

1. When a cat licks its fur, the loose hairs will get stuck on the small comb-like barbs on its tongue. , thus swallowing a large amount of hair, leading to pilosauria, which causes vomiting and inability to eat.

2. Cats eating cold or expired food will cause stomach discomfort and cause vomiting.

3. Not only gastrointestinal diseases can cause cats to vomit, but many major diseases will almost always cause cats to vomit. The specific disease should be checked by the hospital to determine.

4. Parasitic infection can cause cats to vomit. If you see evidence of worms in your cat's vomit or feces, go to your veterinarian and prescribe some deworming medication.

Things to note when a cat vomits and does not eat for three days:

1. Pay attention to the cat’s diet and make sure it drinks water. Do not drink raw or dirty water. It will be difficult to digest if it does not eat. food, do not feed too salty food.

2. Ensure the hygiene and temperature of the home environment. Allow cats to bask in the sun every day in the morning and evening when the sun is mild. Sunbathing can help cats replenish nutrients.

3. You can also feed cats some probiotics to regulate their stomach. Probiotics can treat diarrhea, constipation, indigestion, loss of appetite, acute and chronic intestinal stress reactions and other symptoms in cats.

4. When you see a cat with diarrhea, pay attention to the cat’s mental state and whether the cat is eating normally. If there are other symptoms, such as vomiting, fever, or blood in the stool, please send it to the doctor in time.