Because cats have different levels of nervousness and personalities, they will have different stress reactions, but generally they will show up as: they will get into corners and dark places, and they will not come out no matter how the owner calls; The cat will not eat or drink until it is familiar with the environment; it will observe silently in the corner and come out on its own when people are not around; in severe cases, the cat will vomit and have soft stools.