Prevention or reduction of upper limb edema The circumference of the affected upper limb is generally considered to be <3 5="">5 cm longer than the circumference of the contralateral upper limb as severe edema. Specific methods: (1) Prevent infection: keep the skin on the affected side clean; do not perform invasive operations on the affected arm, such as blood draws and infusions; wear loose gloves when washing and avoid prolonged contact with irritating washing solutions; avoid mosquito bites; always dress and wear jewelry or watches loosely. (2) Avoid high-temperature environment: avoid burns; do not apply hot compresses to the affected arm and do not overheat the water when bathing; avoid bright light exposure and high-temperature environment. (3) Avoid weight-bearing: avoid lifting, pulling or pushing excessively heavy objects; avoid heavy physical labor or more strenuous sports activities. (4) Other: restore arm function as soon as possible; wear elastic cuffs when traveling by airplane. (5) Self-care methods for lymphedema: ①Mild or moderate lymphedema can be treated by elevating the arm, bottom-up centripetal massage along the lymphatic direction, doing arm function restoration training, and wearing an elastic cuff. ②Severe lymphedema can be treated with elastic cuffs or physical therapy. If there are symptoms such as redness or abnormal hardness in the arm, or if the edema is serious, infection should be considered and anti-infection and symptomatic treatment should be given.