The proposed research is designed to establish lymphedema incidence rates for a varied population of breast cancer patients. Patients with breast preservation, mastectomy, sentinel lymph node biopsy, axillary dissection and radiation therapy will be included with the goal of determining the impact that each of these treatments has on development of lymphedema. Establishing incidence in these populations is crucial to the remainder of the study. We conduct a two phase study. The first phase will use arm measurements, a symptom survey (The Lymphedema and Breast Questionnaire), a functional survey (Disability of the Arm, Shoulder, and Hand Questionnaire), and operative and pathology information to create a simple screening tool to predict the development of lymphedema. Currently, lymphedema is only diagnosed after arm swelling develops. The goal of the screening tool is to identify those patients at significantly increased risk for development of lymphedema as compared to the general population of breast cancer survivors. Phase 2 of the study will test a lymphedema prevention strategy in a high risk population. The goal of this phase is to reduce the incidence of lymphedema in those patients that have undergone an axillary node dissection with radiation therapy by using a combination of education, a compression sleeve and decongestive exercises. If prevention is successful, the development of a screening tool becomes even more important to identify those patients that should undergo a prevention regimen.