Breast cancer is one of the most common cancers affecting women worldwide, though it can rarely affect men as well. It occurs when abnormal cells in the breast tissue grow uncontrollably, often leading to the formation of a lump or mass. Early detection through regular screenings like mammography and breast ultrasound significantly improves treatment outcomes and survival rates. Risk factors for breast cancer include increasing age, family history, genetic mutations like BRCA1 and BRCA2, hormonal factors, obesity, and lifestyle habits such as alcohol consumption. Common symptoms include a breast lump, changes in breast shape or size, nipple discharge, skin dimpling, and nipple inversion. Treatment options depend on the type and stage of cancer and may include surgery, chemotherapy, radiation therapy, hormonal therapy, and targeted biological treatments. With timely diagnosis and advanced medical care, the chances of successful treatment and recovery are greatly increased.