Generalized edema in children may be caused by angioneurotic edema, acute glomerulonephritis or heart disease. 1. Angioneurotic edema: If children have allergic reactions to certain drugs, certain diseases or other things, resulting in generalized angioneurotic edema, it can also be manifested as generalized edema. 2. Acute glomerulonephritis: glomeruli have the function of filtration, and when a child suffers from acute glomerulonephritis, the glomerular filtration rate will be reduced, resulting in oliguria, which leads to a decrease in the amount of water discharged from the body, resulting in sodium and water retention, thus causing generalized edema. 3. Heart disease: If a child suffers from heart disease, it is easier to cause heart failure, the contraction and diastolic function of the heart will be impaired, the venous return of blood is impeded, resulting in venous stasis, which can lead to generalized edema. Children with generalized swelling may also be other reasons, parents should take their children to the hospital in a timely manner, with the help of the doctor to clarify the cause of the disease, and targeted treatment or treatment, to avoid delayed treatment to aggravate the condition.