Arm edema is more common after radical breast cancer surgery, about 20-30%. The edema often causes upper limb dysfunction such as limited shoulder joint movement, limb weakness, numbness, pain and other sensory abnormalities, which brings a lot of inconvenience to patients’ daily life. This arm edema is actually a kind of lymphedema, which is caused by the destruction of the normal structure of lymphatic tissues after axillary surgery and/or radiation therapy, causing the accumulation of lymphatic fluid in the subcutaneous tissues due to impaired return flow. In the early stages, the edema is soft and depressible, and gradually deteriorates thereafter. The protein-rich lymphatic fluid develops a degree of browning of the skin during the fibrosis process, followed by sclerosis, hyperkeratosis and thickening. In severe cases, upper limb dysfunction such as limited shoulder joint movement and limb weakness, sensory abnormalities such as numbness and pain, and limb deformities leading to psychological disorders occur. Once the edema of the arm becomes chronic, the treatment effect is poor. The following measures can reduce edema: 1. Avoid excessive blood flow in the upper extremity, high-intensity upper extremity exercise, infection, etc. 2. Avoid increased resistance to lymphatic reflux. For example, overly tight clothing can compress the supraclavicular region. 3.Avoid drug injections, blood draws, immunizations, and blood pressure measurements in the affected upper extremity. 4.Avoid high temperature of the affected upper extremity, such as hot water immersion, sun exposure, sanna bath, etc. 5.Avoid wearing too tight underwear, necklaces and halter bras. In addition, it is very important to prevent infection and moderate amount of exercise. Because the tissue interstices after lymphedema are rich in protein, a tiny skin break can trigger bacterial infection. Therefore, care should be taken to avoid insect bites, prevent skin damage, and use antibiotics as soon as they occur. Moderate activity and exercise can help improve lymphatic circulation. For example, stretching and abdominal breathing can change the pressure in the thorax and promote lymphatic reflux. Upper limb lifting exercises can cause muscle contraction to stimulate the flow of lymphatic fluid. However, too strong exercises or static activities (such as carrying heavy objects) can cause overloading of the lymphatic vessels and aggravate upper limb edema. The following two options are available for treatment: 1. Professional and appropriate massage: It is also the most important means of treating lymphedema at present. Through massage, the lymphatic vessels of the surrounding tissues are first emptied, thus accelerating the lymphatic fluid reflux in the affected upper limb. Massage needs to be carried out by experienced division, using the hands to make the skin move on the subcutaneous tissue, the movement should be moderate and rhythmic; if only sliding on the skin surface is not effective, and too much force may increase blood flow and aggravate edema. Massage needs to be carried out in a certain order, firstly, bilateral neck, then the contralateral armpit, contralateral chest, then to the affected side of the chest, the affected shoulder, and finally the affected upper limb, usually massage the upper arm, then forearm, and finally the wrist joint and fingers. 2, pressure pump therapy: the inflatable cuff is placed on the edematous limb, and the intermittent inflation makes the edematous fluid flow centripetally. These air pressure devices are mostly multi-chamber, sequential, adjustable pressure gradient pumps. The pump pressure decreases centripetally like a wave, squeezing the edema fluid into the blood circulation. This method is effective in the early stages of lymphedema, before the onset of significant subcutaneous fibrosis.