Edema is a condition in which excess fluid accumulates in the interstitial spaces of the body, causing swelling of the tissues. Edema is classified as a localized or generalized condition. The treatment of edema is to remove the excess fluid from the tissues. Localized edema is often caused by obstruction of venous lymphatic flow, local inflammatory trauma or allergies. Usually the symptoms will gradually improve with the application of diuretic, anti-swelling, anti-allergic and anti-infective drugs. Systemic edema, however, is a complex condition, and treatment requires comprehensive consideration. In some cases, the edema is caused by heart failure, so it is necessary to reduce the load on the heart with timely cardioplegia and diuresis, and the edema can disappear. In some cases, nephrolithiasis or nephropathy is the cause of nephrogenic edema. In addition to the application of diuretic drugs, it is also necessary to promptly remove creatinine urea nitrogen and other waste products from the body, improve kidney function, and correct hypoproteinemia, so that edema can be gradually relieved. Some cases of edema caused by nutritional deficiency due to long-term chronic wasting diseases require nutritional support after. Improvement of edema symptoms. Most edema symptoms will gradually improve after treatment of the cause and symptomatic treatment, but in a few chronic diseases, the prognosis is poor.