Inclusion Criteria:  Age：18~75 years; Early stage breast cancer confirmed by histology examination; Patients had undergone surgery for breast cancer; No distant metastasis; Planned to receive recommended postoperative adjuvant chemotherapy; Voluntarily provided written informed consent.  Exclusion Criteria:  Patients already receiving neoadjuvant chemotherapy before surgery; Patients had metastatic disease at diagnosis; Patients had difficulty understanding the questionnaire or communicating in Chinese; Patients had significant psychiatric or other comorbid disease prohibiting participation; Any other researcher believes that it is not appropriate to participate in this test.