Hypnotherapy is an adjunctive technique that utilizes hypnosis to aid in the treatment of specific symptoms or health conditions. Hypnotherapy works by inducing a hypnotic state marked by waking awareness that allows people to experience detached external attention and to focus on inner experiences.

It is sometimes used as part of a treatment plan for phobias and other anxiety disorders. It is also sometimes used for pain management, weight loss, smoking cessation, and a variety of other applications.

Formal explorations in the therapeutic uses for hypnosis began in the late 1700s but did not gain scientific credibility until much more recently. Modern researchers have further explored how hypnosis can be used, which conditions it can treat, and how effective it may be compared to other treatments.