Hypnotherapy.
Hypnotherapy is therapy that is undertaken with a subject in hypnosis.

The word "hypnosis" is an abbreviation of James Braid's (1843) term "neuro-hypnotism", meaning "sleep of the nervous system" However, Braid himself rejected the term "hypnosis" as misleadingly implying a similarity between "hypnosis" and normal sleep. He later attempted to substitute a new terminology by referring instead to "ideism" or "monoideism", an application of the physiological mechanism known as the "ideo-motor response." The ideo-motor theory of suggestion became influential, however, the old terminology of "hypnotism" remains popular to this day.

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,

If a subject after submitting to the hypnotic procedure shows no genuine increase in susceptibility to any suggestions whatever, there seems no point in calling him hypnotised (Hull, Hypnosis & Suggestion, 1933)
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.