Dizziness in breast cancer patients cannot be ruled out as brain metastasis, brain metastasis is a kind of blood line metastasis of breast cancer and it is very common, and the patients will have headache or blurred vision, and they should undergo cranial CT examination in time. Severe multiple intracranial metastatic lesions will lead to increased intracranial pressure, and the patient will have obvious nausea, vomiting and even consciousness disorder. If the condition permits, local radiotherapy can be carried out, and dehydrating and nutritive nerve medicines should be given to reduce the symptoms of cerebral edema and headache. If the condition permits, systemic intravenous chemotherapy can be chosen to control the development of the tumor, and in the later stage, it is mainly to alleviate the pain of the patient. Breast cancer is prone to hematogenous metastasis, which can also be transferred to the vertebrae, or lung tissues as well as liver and other substantial organs.