Renal edema refers to edema caused by kidney disease. Common causes of renal edema: first, when kidney disease occurs in the kidneys, patients will experience a decrease in glomerular filtration rate, which will lead to sodium retention and increase in blood volume causing edema. Second, when kidney disease, especially glomerulonephritis, patients often combined with proteinuria, if persistent proteinuria will lead to hypoproteinemia, causing plasma colloid osmotic pressure decreased, resulting in edema in the tissue space. If there is edema after the emergence of edema, we should go to the hospital to check the urine routine, 24hUP quantification, renal function and other related tests to clarify whether it is renal edema. Treatment of renal edema: first, if it is a large amount of proteinuria, it can be treated with hormones or hormones combined with immunosuppressants; second, it can be supplemented with albumin appropriately; third, it can be treated with diuretics to reduce swelling.