It is incorrect and one-sided to think that an unclear breast border is cancer. When the breast is examined by ultrasound as well as mammography and other imaging examinations, sometimes the unclear border between the breast and the surrounding area is described, but it is not necessarily cancer with the possibility of cancer. In addition to unclear breast border with cancer, it may also be mastocytosis or intraductal papilloma, etc., which may also appear as a breast mass with unclear surrounding border. Therefore, if the breast boundary is described as unclear after ultrasound and other imaging examinations, it is important to actively seek medical advice and do fine needle aspiration pathological examination if necessary, so as to clarify the nature of the lesion and avoid delaying the disease. Patients are advised to make sure to have regular physical checkups, avoid adverse factors, and maintain optimism to prevent the disease from occurring.