If breast cancer metastasizes to the lungs, according to the situation of metastasis in the lungs, early surgical resection treatment should be carried out as soon as possible, and the comprehensive treatment should be supplemented with chemotherapy, targeted therapy and endocrine therapy. If the chance of surgery is lost, internal medicine treatment and symptomatic supportive treatment should be considered. If breast cancer metastasizes to the lungs and a single metastatic foci in the lungs, it is necessary to cooperate with professional doctors to take surgical treatment as soon as possible to remove the metastatic foci, and also assist chemotherapy, targeted therapy, endocrine therapy and other means of comprehensive treatment, so as to facilitate the timely control of the condition, which can effectively inhibit the development and metastasis of the cancer cells, and enable the patients to survive for a longer period of time as far as possible. When breast cancer metastasizes to the lungs and multiple metastatic foci in the lungs, it is necessary to combine the treatment opinions of professional doctors and choose internal medicine treatment as well as symptomatic supportive treatment, etc., so as to improve the patient’s condition as much as possible and slow down the development of the disease. Therefore, once diagnosed with breast cancer metastasis to lungs, it is recommended to cooperate with professional oncologists to formulate standardized treatment plan as soon as possible, in order to get a better prognosis.