Hypnotherapy is therapy that is undertaken with a subject in hypnosis.
The word "hypnosis" (from the Greek hypnos, "sleep")is an abbreviation of James Braid's (1843) term "neuro-hypnotism", meaning "sleep of the nervous system".
A person who is hypnotized displays certain unusual characteristics and propensities, compared with a non-hypnotized subject, most notably hyper-suggestibility, which some authorities have considered a sine qua non of hypnosis. For example, Clark L. Hull, probably the first major empirical researcher in the field, wrote, Hypnotherapy is often applied in order to modify a subject's behavior, emotional content, and attitudes, as well as a wide range of conditions including dysfunctional habits, anxiety, stress-related illness, pain management, and personal development.
