The stress response of a kitten to a new home includes symptoms such as poor energy, loss of appetite, hiding, timidity, nervousness, vomiting, etc. Some kittens will also behave aggressively toward humans. These are all cat stress symptoms. reaction. When a cat has a stress reaction, be sure not to stimulate it anymore. It is best to let the cat relieve its emotions and wait until the cat is familiar with it before giving it snacks and toys. This can distract the kitten and make it more relaxed.