Cats always vomiting may be due to their physiological reactions. For example, after a cat is frightened, it may have a stress reaction, and a cat after stress may vomit.

It may also be that the cat has eaten something it shouldn't have, which has led to food intolerance and ultimately vomiting. Some Digestive system diseases can also cause vomiting, such as bacterial gastroenteritis, viral gastroenteritis, intestinal obstruction, etc.