Symptoms of breast cancer metastasis mainly include weakening of digestive function, intractable pain at night, as well as redness, swelling and ulceration of skin, as follows: I. Weakening of digestive function: if patients’ breast cancer is accompanied by liver metastasis, it will cause damage to liver cells, which will result in obvious reduction of liver enzymes and bile secretion, and patients will suffer from weakening of digestive function, which will be manifested as abdominal pain, abdominal distension and diarrhea after eating. Generally speaking, through enhanced CT examination of liver, the size and specific location of breast cancer metastases in liver can be clarified, and active treatment can achieve relatively good results. Nocturnal intractable pain: if breast cancer patients are accompanied by bone metastasis, they will have nocturnal intractable pain, which can not be relieved by ordinary analgesic drugs, and if necessary, they need to be injected with morphine to alleviate the cancerous pain. Skin redness, swelling and ulcers: if breast cancer patients have skin metastasis, they will show skin redness, swelling and ulcers, which will require long time medication change and surgical treatment.