Breast cancer is more painful for the following reasons: First, patients have lumps and tumors in their breasts, and their physical and mental health will be affected, the tumors have pain, swelling and pain or the tumors have lymph node metastasis, the tumors may be larger and later leading to inflammatory changes around them, or the surface of the tumors have broken down with bleeding, and patients feel more painful. Secondly, after the diagnosis of breast cancer is clear, most of the patients need to undergo surgery, which can be traumatic to patients’ physical and mental health, such as painful wounds during surgery, painful wounds after surgery, possible edema, pain and activity disorders in upper limbs, possible placement of drains and discomfort around the drains, scarring of wounds after full recovery, etc.