Armor chest of breast cancer is a manifestation of advanced stage of breast cancer, which consists of multiple nodules fused into a piece, covering the chest wall on the affected side and extending to other parts of the back, with the nodules forming a plate in the shape of armor. Most of the causes of armored breast cancer are due to hormonal effects, mental factors, bad lifestyle, genetic factors and other triggers of breast cancer. Poor lifestyle and long-term bad emotion on weekdays will lead to the decline of one’s immunity, which will cause the late-stage lesions to metastasize and spread to the surrounding tissues, resulting in the appearance of armored chest. In the early stage, breast cancer patients are mainly treated with medication and surgery, commonly used surgical methods include total mastectomy, mastectomy with breast preservation, etc., with corresponding radiotherapy after surgery. For patients in advanced stage who have already formed armor chest, they can no longer undergo surgical treatment, and they can only choose comprehensive treatment measures such as radiotherapy and endocrine therapy according to their physical condition, so as to reduce the pain of the patients. Patients need to maintain a good state of mind, according to the actual situation with the doctor for examination to clarify the cause of the disease, timely consultation, regular review, pay attention to monitoring changes in the condition.