Cats instinctively have natural reactions to loud or unexpected noises, but some cats have an excessive fear of noise which leads to skittish behavior. In most cases fear of noises are caused by deep seeded insecurities and a lack of trust. If your cat has a fear of noises, there are steps that you can take to foster a trusting relationship with your cat and methods that will help your cat to feel more secure in its environment. It takes time, but eventually your cat will be able to overcome these fears.