The diagnosis of early breast cancer relies heavily on women’s awareness of proper self-care and doing regular breast examinations once a month. For women with normal menstruation, a self-examination should be done 7-10 days after each menstruation when the breasts are relatively loose (e.g. bathing and dressing); for postmenopausal women, they should choose a fixed day every month for regular examination by themselves. When an abnormal shape of the breast is detected or a painless lump is palpated, a doctor should be consulted. Depending on the results of palpation and age, the doctor will choose whether to do further examinations and which instrumentation to use. It is recommended that women over the age of 40 have 1-2 mammograms per year; women under the age of 40 have an ultrasound examination of their breasts once a year. The frequency of future exams is then decided based on the results. Women with family history, other previous breast diseases, those who have not given birth or did not give birth until after 35 years old, those who have not breast-feeding, and those who stop menstruation late after 55 years old belong to the high-risk group of breast cancer. These women should go to regular specialized medical institutions for regular breast examinations and master the correct self-examination methods in order to facilitate early detection of possible abnormalities, timely exclusion or definite diagnosis and start reasonable treatment.