Swelling on the top of the foot, the following reasons are common: First, the top of the foot local blood circulation is very rich, after the occurrence of broken foot, the permeability of blood vessels will increase significantly, so the blood vessels on the top of the foot will continue to ooze out, resulting in serious edema of the tissue gap. Secondly, the subcutaneous tissue of the plantar surface of the foot is loose connective tissue, the tissue gap is relatively loose, once the blood vessels of the liquid exudate, can easily enter this gap, resulting in edema of the plantar surface of the foot. The subcutaneous tissue of the plantar surface of the foot is relatively tight, so it is not easy to produce local edema. Third, the top of the foot has a dense distribution of metatarsal bones, and if a metatarsal fracture dislocation occurs when the fracture occurs, it will cause severe edema of the surrounding soft tissues. To summarize, the above three reasons are the common causes of the condition of edema on the top of the foot when breaking the foot.