Effect of hypnosis before general anesthesia on postoperative outcomes in patients undergoing minor surgery for breast cancer: a systematic review and meta-analysis.

Background: Preoperative anxiety is a common phenomenon in breast cancer, causing pain and tension, which is not conducive to the effective surgical treatment and postoperative recovery. It is believed that hypnosis can change the patient's perception of pain, thereby improving the patient's ability to control pain. However, the results of studies for this topic were controversy.