Axillary pain one month after mastectomy may be caused by normal postoperative reaction, scar contracture and so on, which can be treated by medication and general treatment. 1. Drug treatment: patients can usually be treated with drugs such as propacetamol, which are analgesic drugs that can relieve the pain caused by the lack of wound healing and wound pulling. Overdose of these drugs may cause dizziness, dry mouth, vomiting and other adverse reactions. Patients with severe liver impairment should not use these drugs. 2. General treatment: patients can usually reduce the pain caused by wound pulling by making a fist, stretching the arm and other movements, and at the same time, they should eat high-protein, vitamin-rich food to adjust the diet, which is conducive to wound healing and can reduce the postoperative pain. The pain in the armpit after breast cancer resection may also be caused by metastatic lymph nodes, which should go to the hospital in time to clarify the cause and follow the doctor’s instruction. Meanwhile, it is recommended that postoperative breast cancer patients should carry out rehabilitation exercises at an early stage to promote recovery.