Breast cancer patients can cohabit with each other, breast cancer is not a contagious disease, cohabitation will not be infectious. Breast cancer is one of the common malignant tumors in women, and its pathology can be divided into non-invasive carcinoma, invasive specific carcinoma and invasive non-specific carcinoma, and non-invasive carcinoma can be intraductal carcinoma, lobular carcinoma in situ and other types. Invasive specialized carcinomas can be papillary carcinomas, medullary carcinomas and other types, while invasive non-specific carcinomas can be invasive lobular carcinomas, invasive ductal carcinomas and other types. This type of disease is most often treated by surgery, and coitus should be avoided for one month after surgery and then again after recovery from surgery. Cohabitation does not affect the quality of life of the cohabiting partner, so there is nothing to worry about, which means that cohabitation is possible with any type of breast cancer, but it should be avoided one month after the surgery for breast cancer.