Most breast cancer is discovered by the woman herself or, in some cases, by her partner. When Janet found a lump, she showed it to her daughter who is a GP. Nov 27, - Breast cancer is the most common cancer among women. Symptoms include a lump or thickening of the breast, and changes to the skin or the nipple. Risk factors can be genetic, but some lifestyle factors, such as alcohol intake, make it more likely to happen.Symptoms · Stages · Causes · Types.