Women between the ages of 20 and 39 who have no symptoms of breast disease should have a clinical breast examination every 3 years. A physician, a nurse practitioner, a nurse, or a physician assistant can perform this examination. The health care professional will examine both breasts for discrepancies in size or shape. The examiner will also palpate (feel) each breast to detect any lumps or masses. The area under both arms will be examined as well, to check for enlargement of lymph nodes.