The symptoms of lobular hyperplasia transforming into cancer primarily include feeling a painless, solitary small lump in the breast. The lump is hard, with a rough surface, and its boundary with surrounding tissue is not clearly defined. It is not easily movable within the breast. As the lump progresses, it can invade the Cooper's ligaments, causing them to contract, and thus the skin over the lump often appears dimpled, known as the dimpling sign, which is an early sign of breast cancer. As breast cancer continues to develop, it can cause the breast to shrink, become harder, elevate the nipple, and may lead to the ducts being pulled, flattened, retracted, or even invaginated. The affected breast may also significantly enlarge over several months, causing an increase in volume and prominence.