Non-invasive breast cancer is medically known as in situ breast cancer, and is usually treated with surgery, which includes mastectomy, after which adjuvant treatment with medications may be considered. In the adjuvant treatment, the main drugs are tamoxifen, raloxifene and so on. Non-invasive breast cancer is one of the types of breast cancer, and the current surgical method is mainly based on puncture biopsy and imaging examination. Mastectomy is a total mastectomy. Breast-conserving surgery involves removing a portion of the lump, and medication is needed to supplement the treatment after the surgery. After receiving surgical treatment, in order to effectively reduce recurrence, raloxifene and tamoxifen can be used under the guidance of the doctor, but prolonged endocrine therapy may have some adverse reactions, and regular follow-up management is needed. Non-invasive breast cancer is a relatively complex disease, and there are many ways to treat it, mainly by combining the patient’s symptoms, so it is recommended to strictly follow the doctor’s instructions.