Hypnotherapy is a form of psychotherapy used to create change in a patient while in a state of sleep, or unconsciousness, known as hypnosis. 

The word hypnosis comes from the Greek word “hypnos” which simply means, “sleep.” 

The therapy itself uses guided relaxation techniques from a trained hypnotist that invoke feelings of intense relaxation, concentration, and/or focus to achieve a heightened state of awareness or trance-like state.

The therapy is commonly used as an aid to psychotherapy due to the relaxed nature brought on by the hypnotic state that allows people to explore painful and suppressed feelings and emotions or memories that are often hidden from their conscious minds. 

This change in consciousness can often lead patients to experience things differently outside of hypnosis, such as criticism at work or home, stage fright, or even pain.

Source

What is hypnotherapy? (2017). www.therapytribe.com