Left breast invasive carcinoma belongs to invasive breast cancer, which is a malignant tumor, the cause of which is not yet clear, and it is considered to be related to factors such as heredity and high level of estrogen, and there will be manifestations such as breast lump and nipple overflow, etc. Surgery, radiotherapy, chemotherapy, endocrine therapy, and targeted therapy can be adopted. Left breast invasive carcinoma generally belongs to invasive breast cancer, which refers to malignant tumors occurring in the ductal epithelium or follicular epithelium of the breast, and the tumor has the ability of distant metastasis. The etiology of invasive breast cancer is not clear, and it is considered to be related to heredity, high estrogen level, long-term radiation exposure, and benign breast diseases. Patients with breast cancer may present with breast lumps, nipple discharge, nipple inversion, breast pain, and enlarged axillary lymph nodes. Patients clearly presenting with invasive breast cancer can be treated with surgical excision (total mastectomy + sentinel lymph node biopsy, modified radical mastectomy, etc.) simple mastectomy, radical mastectomy, as well as radiation, and chemotherapeutic drugs such as cisplatin and paclitaxel as prescribed by the doctor. Some patients can also be treated with targeted drugs such as lapatinib and trastuzumab under the guidance of doctors. Or apply endocrine therapy and radiation therapy and other comprehensive treatment programs as prescribed by doctors. Generally speaking, the prognosis of early invasive breast cancer patients is generally good if they take appropriate measures under the guidance of doctors in time. If patients with middle or advanced invasive breast cancer do not take timely measures for treatment, the prognosis may be worse. It is recommended that patients with invasive breast cancer should consult a doctor in time and take appropriate treatment according to the doctor’s instructions.