Participants in this group will:

1. Completed questionnaires about daily function and mood,
2. Undergo arm circumference measurement conducted by medical staff, and
3. Undergo Lymphedema Index Test (L-DEX) or measurement of tissue water content, conducted standard of care.

Total expected participation is about six months.

Patient reported outcomes (PROs) are a measure of health-related quality of life. The Functional Assessment of Cancer Therapy-Breast (FACT-B+4) will be administered to participants to measure the change in the quality of life after axillary dissection. The FACT-B+4 is a 41-item questionnaire designed to measure six domains of health-related QOL in breast cancer patients: Physical, social, emotional, functional well-being, breast-cancer subscale (BCS) as well as lymphedema subscale. Each response within each domain is scored on a five-point Likert scale ranging from "0" (not at all) to 5 (very much). Higher scores indicate a better quality of life.

Patient reported outcomes (PROs) are a measure of health-related quality of life. The Lymphoedema Functioning, Disability and Health Questionnaire (Lymph-ICF) will be administered to participants to measure the change in quality of life after axillary dissection. The Lymph ICF is a 29-item questionnaire about impairments in function, activity limitations, and participation restrictions of patients with breast cancer and arm lymphedema. The questionnaire is divided into 5 domains: Physical function, mental function, household activities, mobility activities, and life and social activities. Each response within each domain is scored on a 11-point Likert scale ranging from "0" (not at all) to "10" (a lot). Lower scores indicate a better quality of life.

The LYMQOL-Arm, primarily as a self-assessment report questionnaire assessing the symptoms of lymphedema in the upper extremity and the ability to perform functional activities in patients with breast cancer-associated lymphedema. There are five subsections in the 21-question survey. These are upper extremity function (questions 1a-h,2,3), appearance (questions 4-8), symptoms (questions 9-14), emotional state (questions 15-20), and general quality of life ( 21st question). In the first 20 questions, there are four options for each question: none (1 point), a little (2 points), quite (3 points), and a lot (4 points). The scores of these subsections are summed up within themselves and divided by the number of questions answered. In the 21st question, the patient is asked to give a value between 0 and 10 for the quality of life. High scores for the first 20 questions and low scores for the 21st question indicate poor quality of life.

Breast Cancer-Related Lymphedema (BCRL) status among study participants as measured by odds ratio.