The exact cause of breast cancer is yet unknown. However, it is found to be associated with certain factors. Some of those risk factors can be controlled by the patient, while some are beyond control. Known causes Long and excessive exposure to estrogen hormone such as menstruation periods starting at early ages, ending at late
Breast Lump The first and important sign of breast cancer in approximately 70% of the patients is presence of a lump. It is mostly felt on the upper outer quadrant of the breast by physical examination, borders of the lump generally cannot be identified well, and may have a rough or ragged surface. 90% of