Swelling of children’s hands is considered to be caused by soft tissue injury, angioneurotic edema, hypoproteinemia and other factors. 1. Soft tissue injury: If children’s hands are hit by external forces, it will cause inflammation and edema in the local muscles and other soft tissues, which will cause swelling of the hands. 2. Angioneurotic edema: If children are allergic to allergic substances, after eating allergic substances or contacting allergens, the local vascular permeability will be increased, which will lead to the swelling of children’s hands. 3. Hypoproteinemia: If a child suffers from hypoproteinemia, the fluid in the blood vessels will leak out and enter the local soft tissues, thus triggering the swelling of the hands. Children’s hand swelling, there may be other reasons, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.