Multimodal Pain Treatment for Breast Cancer Surgery - a Prospective Cohort Study

All patients scheduled for breast conserving surgery or mastectomy with or without ALND or SLNB at Zealand University Hospital, Roskilde, will be invited to participate in the study. When the patients arrive for preoperative preparation on the day of surgery, one of the investigators will be responsible for a thorough oral information regarding the purpose of the study and all relevant participation requirements. The conversation will take place in a closed room, and the informed consent form will be obtained if the patient decides to participate. Furthermore, patients will be informed that participation is voluntary and that a wish for withdrawal will be granted immediately. The informed consent will grant the investigators direct access to data in the patients' electronic files to ensure the information necessary for the study. The patients also consent to complete the questionnaires in the seven-day follow-up period, and that the investigators can reach them by phone. Completion of the study It is considered a completion of the study when a patient has signed the informed consent, has followed the treatment regimen, and answered the questionnaires in the seven-day follow-up period. If a patient does not complete the study, an account should be given as to whether and how this subject's data is handled in the study - this also replies to drop-outs. Reasons for withdrawal \- If a patient wishes to withdraw from the study In accordance with the Declaration of Helsinki, patients have the right to withdraw from the study at any time for any reason. The investigators also have the right to withdraw a patient from the study at any time. The reason for withdrawal must be recorded.