Cancer begins when healthy cells in the breast change and grow out of control, forming a mass or of cells called a tumor. A tumor can be cancerous or benign. A cancerous tumor is Malignant, meaning it can grow and spread to other parts of the body. A benign tumor means the tumor can grow but will not spread. Breast cancer spreads when breast cancer cells move to other parts of the body through the blood vessels and/or lymph vessels. This is called metastasis.
Breast cancer is the most common cause of the death in women, according to a survey conducted by WHO the most of the younger women's are affected by the breast cancer. If eight women live to the age of 85, at least one of them will develop breast cancer in her lifetime.