Adults 18 and over who are diagnosed with unilateral breast cancer.

Unilateral lumpectomy, unilateral mastectomy, or simultaneous contralateral prophylatic mastectomy within 12 months of enrollment

Axillary lymph node dissection or sentinel node biopsy within 12 months of enrollment

Adjuvant or neoadjuvant chemotherapy and/or radiation therapy are allowed

Breast cancer reconstruction completed or planned is allowed

Study participants must own or have access to a smartphone, iPhone (IOS version 9.0 or above) or Android phone (Android 8.1 or above).

Efficacy Verification in Early Diagnosis and Management of Lymphedema Through Home Body Water Analyzer