In the old pre-historic times influential people, like healers, priests, shamans, and midwives, have been using hypnosis next to the herbs and self-made medicine they gave to people to feel better or overcome illnesses, often without them knowing what they did.
Even today, when a mother puts a kiss on the sore spot of a child’s arm or leg, the pain disappears as by magic. It’s called suggestion, the base of hypnosis.