Swelling of the surrounding soft tissues after a fracture is not the main manifestation, but the local formation of a larger hematoma, which is formed mainly due to the rupture of the bone marrow, periosteum, and blood vessels in the surrounding tissues, so that a hematoma is formed at the fracture site. It is the soft tissue injury that leads to a larger edema, which in severe cases can lead to severe swelling of the limb on the injured side, and even tension blisters and subcutaneous bruising. The fracture causes severe pain because it can stimulate the nerves, and the pain can increase suddenly especially when moving. If the fracture is not treated in time, shock may occur due to massive bleeding, and severe open fractures may lead to damage to internal organs and may cause death.