Advanced breast cancer does not spread indoors through the air, and this disease is not a contagious disease. Patients should correctly recognize this disease and actively cooperate with doctors for treatment. The cause of breast cancer is still unclear, and it is mainly believed to be related to hormone effects, genetic factors, radiation factors, mental factors and environmental factors. The disease is not a contagious disease and will not be transmitted to relatives in any form. However, people with a family history of breast cancer have a relatively high incidence of the disease and should be alert to the possibility of the influence of genetic factors. The advanced stage of breast cancer may lead to skin satellite nodules, nipple overflow, or even metastasis of cancer cells, which seriously threatens the life of patients. It is suggested that patients should correctly recognize breast cancer and clarify its harm. And actively cooperate with doctors for treatment.