Breast nodules
Not all breast nodules are breast cancer. In fact, only a minority of them will be breast cancer. However, they need to be evaluated by a doctor if you ever find one. Breast cancer nodules are not usually painful, and they do not come and go with your menstrual cycle. Nodules are more suspicious if they are very hard, irregular in shape, and if they are fixated on the muscles or the skin.
Change in the shape or size of the breasts
Some patients do not report any nodules, but they do have changes in the shape or size of the breasts. They start to mismatch, and the difference becomes noticeable over time.