1. Concept: After breast cancer surgery, the upper limb on the diseased side is swollen, heavy, painful, with reduced motor function, weakness and stiffness. With the prolongation of disease period, skin thickening and local soft tissue infection occur repeatedly. 2, Etiology: breast cancer surgery for axillary lymph node dissection, axillary lymphatic vessel dissection and destruction, lymphatic reflux of the affected limb is blocked, proteins and other macromolecular substances in lymphatic fluid accumulate in the tissue interstitial space, osmotic pressure of the tissue interstitial space rises, and liquid is retained. In some patients with radiotherapy, radiotherapy causes fibrosis of local tissues, lymphatic vessels and lymph nodes, which further aggravates the obstruction of lymphatic return and increases the swelling of the affected limbs. 3, Incidence: comprehensive domestic and foreign literature reports that lymphedema often occurs in the first 4 years after surgery, the incidence rate of about 25%. 4, treatment: (1) elevate the affected limb, patients try to elevate the affected limb when sitting or resting, to avoid the affected limb drooping for too long. (2) Massage, elevate the affected limb, start from the distal end to the proximal end of the fingers to push, massage, promote lymphatic reflux. (3) Gradient pressure cuff, at present, there are different kinds of pressure cuffs at home and abroad, by giving the affected limb different gradient pressure from distal to proximal, to promote lymphatic reflux of the affected limb. (4) There is no specific drug treatment for lymphedema. (5) There is also no good surgical treatment for lymphedema. 5.Prevention of lymphedema: (1) Try not to wear rings or bracelets on the affected limb. (2) Try to wear loose clothing and loose gloves. (3) Avoid tight bra straps. (4) Avoid using shoulder straps to carry boxes and bags. (5) Avoid using the affected limb to measure blood pressure, draw blood, give injections and vaccinations. (6) Avoid overcooling and overheating of the affected limb, and do not apply hot packs on the affected limb. (7) Avoid excessive exercise to pull the affected limb, do not use the affected limb to lift heavy objects. (8) Avoid trauma to the affected limb. If there is localized redness, swelling and pain in the affected limb, and there is a possibility of soft tissue infection, it is necessary to consult a doctor in time.