The possibilities of having a round thing in the breast are very many, and it must depend on the age group; if the woman is in her childbearing years, cystic hyperplasia of the breast or fibroadenoma of the breast is usually more likely. If it is a woman in her forties or fifties, middle-aged, middle-aged or older, breast cancer is more likely. If this is the case, it is important to go to the hospital for a relevant examination, usually do breast ultrasound and molybdenum target to observe the basic nature of the breast, but also can not rule out the possibility of cystic hyperplasia or small nodules. If it does produce pain or discomfort symptoms, and in a short period of time a sharp increase in size, must go to the hospital for examination, the worst may be breast cancer, must be detected as early as possible, early treatment.