The common causes of children’s swollen hands and feet for no reason include: allergy, glomerulonephritis, nephrotic syndrome and so on. 1. Allergy: often due to insect bites, food allergies, etc., accompanied by rashes, itching discomfort, can appear hands and feet swollen for no reason. 2. Glomerulonephritis: often occurs after upper respiratory tract infection, accompanied by facial swelling, oliguria, hematuria, etc., swelling of hands and feet for no reason. 3. Nephrotic syndrome: can also be manifested as swelling of the hands and feet, often depressed edema, accompanied by a large amount of proteinuria, hypoproteinemia, and lipid metabolism abnormalities. Children with swollen hands and feet for no reason, there may be other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.