The nature of a breast lump needs to be determined when it is found clinically, and pathological findings are the most reliable when the lump is suspected to have malignant potential. Puncture can clarify the characteristics of the tumor and provide guidance for diagnosis and treatment, therefore most tumor patients need to undergo puncture examination before surgery. Clinical puncture is an invasive procedure and is performed under local anesthesia. A large number of clinical trials have shown that puncture can cause bleeding and other complications. After puncture, a pressure dressing is required. The dressing may be painful, but overall it is safe.