Generally, patients with carcinoma in situ of the breast cannot be discharged from the hospital 2 days after removal of the whole breast, and most of the patients can be discharged from the hospital in about 1~2 weeks after operation. Breast carcinoma in situ refers to a relatively limited lesion without infiltration and distant metastasis, including intraductal carcinoma of the breast and lobular carcinoma in situ, which has a better prognosis. After removing the whole mammary gland through surgery, chemotherapy or radiation therapy is usually not needed, so the hospitalization time of patients will be shorter compared with other invasive cancers. After surgery, patients need to be closely monitored for recovery to avoid wound infection. If the patient is in relatively good health, he/she can usually be discharged from the hospital in about 1 week. If the patient is physically weaker, or if there are complications or infections after the operation, the hospitalization time needs to be extended appropriately, and the patient may be discharged in about 2 weeks. It is recommended that the patient actively cooperate with the doctor’s treatment and wait until the body basically recovers before being discharged from the hospital. If there are any other abnormalities after discharge, it is recommended to consult a doctor in time.