What are the Symptoms of Breast Cancer?

Breast cancer happens when the cells in one or both breasts grow in an uncontrolled and abnormal manner, and it may also spread to other body parts. Most often, cancer starts with the cells present in the milk-producing ducts. Though it is a leading cancer and one of the well-researched cancers, the cause of breast cancer is not yet fully understood. However, there are some factors that increase the chance of developing this cancer.