A lump in the breast, changes in breast shape or size, skin alterations on the breast, nipple discharge, and pain are common symptoms associated with breast cancer. The CA 27.29 blood test, used to measure cancer antigen 27.29, does not directly cause symptoms but is instrumental in monitoring and managing breast cancer. Individuals with a history of breast cancer undergo CA 27.29 testing to track disease progression or treatment response. Elevated levels may indicate the presence of cancer cells, while decreasing levels suggest a positive response to treatment. The test could be a vital component in guiding comprehensive breast cancer management decisions.