Causes: The exact cause of breast cancer is not fully understood, but it is believed to result from a combination of genetic, environmental, and lifestyle factors. Some women have a higher risk due to a family history of breast cancer or genetic mutations like BRCA1 and BRCA2. Types: There are different types of breast cancer, but the most common is invasive ductal carcinoma. Other types include invasive lobular carcinoma, ductal carcinoma in situ (DCIS), and inflammatory breast cancer, among others. Symptoms: Symptoms of breast cancer can vary, but they often include a lump or mass in the breast, changes in breast shape or size, nipple discharge, skin changes on the breast, or breast pain. However, some breast cancers may not cause any noticeable symptoms. Diagnosis: Breast cancer is typically diagnosed through a combination of methods, including mammography, clinical breast exams, ultrasound, and biopsy. Biopsy involves taking a sample of the suspicious tissue to determine if it is cancerous.