Edema in advanced stage of breast cancer can be reduced by conservative treatment, drug treatment and diet improvement. 1. Conservative treatment: increase local circulation and promote lymphatic reflux by way of conservative treatment, so that tissue fluid can enter into lymphatic fluid, thus reducing edema. 2. Drug treatment: Mannitol and diuretics can be used to relieve edema temporarily. However, the root cause of edema is still the cancer cells, so treating the cancer cells is the fundamental solution to edema. 3. Dietary improvement: patients can choose foods with relatively high albumin for supplementation, such as meat, eggs and so on, which can effectively relieve the symptoms of edema in late stage of breast cancer. When edema occurs in breast cancer patients, they should be examined in time under the guidance of doctors and be treated and diagnosed under the guidance of doctors.