Untreated invasive breast cancer is more harmful, which may compress the surrounding tissues, form metastatic cancer and reduce the survival rate. 1. Pressure on surrounding tissues: invasive breast cancer grows faster, if not treated in time, the tumor will gradually increase in size and press the surrounding tissues, and the pain will be obviously aggravated. 2. Formation of metastatic cancer: if invasive breast cancer is not treated in time, the cancer cells will metastasize or spread to other parts of the body, which will easily lead to metastatic cancer, for example, liver cancer, lung cancer, lymphoma and so on. 3. Decrease survival rate: invasive breast cancer has poor prognosis, untreated will affect the survival rate of patients, resulting in decreased survival time and some patients’ lives are in danger at any time. If invasive breast cancer is left untreated, it may have the above consequences. Once the disease is detected, it is necessary to consult a doctor in time and carry out regular treatment under the guidance of a professional physician. The disease can be diagnosed and treated early, which can prolong the survival time of patients and improve the quality of life.