Breast cancer is a cancer that develops from breast tissue. Signs of
breast cancer may include: a lump in the breast, a change in breast shape,
dimpling of the skin, milk rejection, fluid coming from the nipple, a newly
inverted nipple, or a red or scaly patch of skin. In those with distant spread
of the disease, there may be bone pain, swollen lymph nodes, shortness of
breath, or yellow skin.
Risk factors for developing breast cancer include obesity, a lack of physical
exercise, alcohol consumption, hormone replacement therapy during menopause,
ionizing radiation, an early age at first menstruation, having children late
in life (or not at all), older age, having a prior history of breast cancer,
and a family history of breast cancer.