Inclusion Criteria:  Women patient over 18 years-old Patient scheduled for a mastectomy with immediate reconstruction by latissimus dorsi flap with or without symmetrization on the contralateral breast. Patient affiliated or beneficiary of a social security scheme. Patient who has given her free and informed consent. Preoperative blood test showing no contraindication to the operation.  Exclusion Criteria:  Refusal of the patient. No indication for auriculotherapy: Patient having a heavy treatment with neuroleptics, Or tricyclic antidepressants which interfere with the action of auriculotherapy. Patient undergoing long-term morphine treatment for chronic pain. Patient with unweaned opioid addiction. Chronic painful patient. Protected patient: Major under guardianship, curatorship or other legal protection, deprived of liberty by judicial or administrative decision; Hospitalized without consent. Pregnant, breastfeeding or parturient woman. Patient participating in another interventional study. Patient who had already participated in this study as part of first breast surgery. Patient receiving regular care by auriculotherapy