Hypnosis is best described as a very deep state of relaxation. Hypnosis is a normal, natural, healthy state of mind. It is a naturally occurring body defence mechanism. Hypnosis appears spontaneously as a protective mechanism in humans when they are frightened, disoriented, or in situations of severe mental or physical stress. hypnosis is used as a psychological treatment to help you experience changes in sensations, perceptions, thoughts, or behaviors.