A breast lump is a mass or swelling in the breast tissue that can be felt by touch. Breast lumps can be caused by a variety of factors, including hormonal changes, cysts, fibroadenomas, and breast cancer. Symptoms of a breast lump may include a lump or mass in the breast tissue, changes in breast shape or size, nipple discharge, or changes in the skin texture or color of the breast. Any changes or abnormalities in the breast should be promptly evaluated by a healthcare provider, who may perform a physical exam, imaging tests, or a biopsy to determine the cause of the lump.