Ductal carcinoma in situ means that the lesion is confined within the breast duct and has not yet spread or metastasized. Most patients may have no conscious symptoms, while a few patients may have symptoms such as nipple discharge, localized redness and swelling of the breast, and breast lumps. Patients are usually detected during mammography, breast ultrasound, MRI and other examinations of the breast. As this type of breast cancer is usually in the early stage, it can be clinically cured with timely treatment, and patients are preferred to undergo surgical resection, such as simple excision of the tumor and total mastectomy, and can combine with radiotherapy and endocrine therapy after surgery. However, there is a possibility of recurrence, so patients should undergo regular review. It is recommended that patients should have early treatment in order to get a better prognosis and avoid the spread of cancer cells, which may cause adverse consequences.