Breast cancer metastases include lymph node metastases and bloodstream metastases. Enlarged lymph nodes in the armpit or enlarged supraclavicular and subclavicular lymph nodes with localized pain is a clinical sign of breast cancer cell spread and is the most common manifestation of lymphatic metastasis. Patients with breast cancer can also spread and metastasize through hematogenous metastasis, most commonly in the liver and lung tissues, with obvious pain in the right upper abdomen, weakness, loss of appetite, weight loss, and jaundice in breathing, as well as a large amount of fluid in the abdominal cavity, and in severe cases, secondary infection. The common symptoms of pulmonary metastasis are coughing, coughing up sputum and coughing up blood or chest tightness, which is aggravated by activity.