Tightness in the armpit after lymph node dissection of the armpit for breast cancer is a normal phenomenon if the symptoms are mild, and can be left untreated for the time being. If the symptoms are more serious and accompanied by serious swelling, you can carry out anti-swelling and anti-infection treatment or elastic bandage to reduce the obstruction of lymph node reflux, so as to relieve the tightness. In breast cancer surgery, it is usually necessary to remove lymph nodes and surrounding fat tissue in the axilla during the operation, and after the operation, there will be discomfort such as axillary scar contracture and lymphedema, which is a normal phenomenon because the subcutaneous fat and lymph nodes have already been removed, and only the muscle and skin are left to grow together, and the discomfort of tightness in the axilla after the operation is a normal phenomenon, which does not need any special treatment. However, if there is axillary edema or upper limb edema on the side of the operation, elastic bandage can be used. If you consider that there is a possibility of infection, you need to carry out a puncture to draw fluid to give the application of ceftriaxone and other antibiotic treatment. It is recommended that the patient go to a regular hospital, except for pathological conditions, the use of drugs need to be under the guidance of a doctor.