Whether breast tumor surgery is dangerous or not depends on the patient’s preoperative preparation. If there is no preoperative complication of hypertension, diabetes or heart disease, it is relatively safe. Breast tumor surgery, because it is performed on the surface of the body, has certain risks except for malignant tumors, which may have blood clots and pneumothorax. Benign tumors have almost no great risk unless there is bleeding, which will slowly appear as a hematoma and will be absorbed after some time, which is benign tumors. However, malignant tumors may have some side effects. In conclusion, breast tumor surgery is relatively safe and effective.