Inclusion Criteria:  Patients scheduled for day-case unilateral breast conserving surgery or mastectomy +/- ALND or SLNB. Age ≥ 18 years of age. Patients who received written and oral information, and have signed the informed consent form on participation in the study. Patients living in the Region of Zealand.  Exclusion Criteria:  Not able to speak, read, or understand Danish. Inability to cooperate and to consent.