A metatarsal fracture with a bump on the dorsum of the foot may be a local deformity caused by the fracture itself, or it may be caused by a local hematoma due to the fracture. 1. The fracture itself: the metatarsal bone is located in the middle part of the foot, equivalent to the metacarpal bone of the human hand. If the metatarsal bone is fractured due to trauma or osteoporosis, it may cause displacement of the broken end of the fracture in the injured area, change of the normal shape of each part of the foot bone, and cause local deformity, resulting in the symptom of a bump on the dorsum of the foot. 2. Hematoma after fracture: metatarsal fracture may cause pathological changes such as subcutaneous blood vessel fracture and soft tissue congestion, resulting in obstruction of venous and lymphatic reflux and accumulation of blood and lymphatic fluid around the injured area, which leads to an increase in the permeability and pressure of blood vessels, and precipitation of intravascular material into the tissue gap to form a hematoma, which can lead to a bump on the dorsum of the foot. The symptoms of a metatarsal fracture with a raised dorsum of the foot alone may not be able to accurately determine the cause of the fracture, and it is necessary to combine with the characteristics of the medical history and other test results to make an accurate judgment, and it is recommended to clarify the cause of the disease under the guidance of a doctor.