Breast cancer is a type of cancer that begins in the cells of the breast. It can occur in both men and women, but it is much more common in women. Here is some information about breast cancer including symptoms, causes, and treatment options: Symptoms of Breast Cancer: Lump or Mass: The most common symptom is the presence of a lump or mass in the breast. It may feel different from the surrounding tissue and may or may not be painful. Changes in Breast Size or Shape: Any unexplained changes in the size or shape of the breast should be evaluated. Skin Changes: These can include redness, dimpling, or puckering of the skin over the breast. Nipple Changes: This may include nipple inversion (turning inward), discharge other than breast milk, or changes in the skin around the nipple. Breast Pain: While breast pain is more commonly associated with benign conditions, it can also be a symptom of breast cancer. Swelling in the Armpit or Collarbone Area: This can occur when breast cancer sp...