This document discusses the clinical presentation of breast cancer. It notes that breast cancer has a bimodal age distribution and that about 10% of cases have a family history that may explain the cause. The most common presenting symptom is a painless lump or thickening in the breast. On physical examination, inspection focuses on checking for asymmetry, changes to skin or nipple appearance. Palpation techniques are used to further examine any breast masses or enlarged lymph nodes found. Common signs include the presence of a breast mass, skin changes like peau d'orange, or nipple retraction.