Milk has no substantial relationship with breast cancer. Breast cancer patients can be treated with medicines such as methotrexate tablets or surgical methods under the guidance of doctors. Milk contains vitamin B12, calcium, protein and other substances, as well as phosphorus, sulfur and other trace elements, moderate consumption of milk can replenish the nutrients needed by the body. Drinking milk does not cause breast cancer, and breast cancer patients can supplement the body’s required calories by drinking milk in moderation. When patients develop breast cancer, it may be caused by heredity, endocrine hormones and other factors. The treatment of breast cancer patients should be based on the specific staging and postoperative pathology molecular typing and other comprehensive treatments, such as modified radical mastectomy, radiotherapy, chemotherapy and other treatments. Consumption of milk does not cause breast cancer, but it may lead to nutritional imbalance when consuming milk singly and in excess for a long period of time.