A child with a fractured hand is at high risk of swelling. The fracture of the hand is usually caused by external forces. The fracture may be accompanied by damage to the surrounding soft tissues, or the fracture may be displaced, causing compression of the surrounding vascular nerves and other tissues, affecting the local blood circulation and resulting in local swelling, which may be accompanied by severe local pain and limited movement. The diagnosis can be clarified by taking an X-ray or CT examination. Depending on the specific situation of the fracture, conservative treatment such as external fixation of the affected limb in a cast or splint is sampled. In case of severe fracture displacement, surgery is also required. The swelling will gradually subside 1-2 weeks after treatment, but if there is persistent swelling or even further aggravation, it should be considered whether it is due to inadequate local fixation or serious soft tissue injury, and the cause needs to be further identified before treatment.