There is no definite time for breast cancer to form, depending on the degree of malignancy of the breast cancer. For low malignant breast cancer, the formation time is usually 5-10 years or even longer, and for the type of invasive breast cancer with a higher degree of malignancy, the formation time is usually around 3 to 5 years. After diagnosis of breast cancer, treatment can be carried out by consulting medical doctors to conduct examinations such as mammography and breast ultrasonography, and according to the results of the diagnosis. For the treatment of breast cancer, surgery, radiotherapy, chemotherapy and other comprehensive treatments need to be taken according to the specific stage of breast cancer, typing and so on. Patients suffering from breast cancer should pay attention to balanced diet, appropriate exercise, keep optimistic mood and treatment under the guidance of doctors.