Puncture usually does not lead to accelerated tumor growth. Breast cancer that grows fast after having a puncture may be caused by hematoma, inflammation, or the tumor itself is highly malignant. 1. hematoma: after doing puncture for breast cancer, it is necessary to press on the affected area for half an hour, if the pressure is not in place, there will be a risk of bleeding, so the patient’s affected area grows very fast may be the bleeding caused by puncture biopsy, which forms a hematoma. 2. Inflammation: the fast growth of breast cancer after puncture may also be caused by inflammation and infection, and the local infection after operation and low resistance of patients may trigger the fast growth of the affected area. 3. High degree of malignancy of the tumor itself: the tumor itself has a high degree of malignancy, which may stimulate the affected area when it is treated as a puncture, thus the phenomenon of fast growth occurs. After having breast cancer puncture surgery, patients should pay attention to observe whether there is bleeding at the puncture point, and change medicine for the affected area regularly to prevent infection. After having breast piercing, if patients find that the affected area becomes bigger, they should go to the hospital in time for diagnosis and treatment by professional doctors.