Fractures generally have the following clinical manifestations and phenomena: 1. Pain. Whether the fracture is a minor linear fracture, a stress or fatigue fracture, or an apparently comminuted fracture with displacement, there will be significant pain at the fracture end. 2. Swelling. Swelling will be evident at the fracture end because the fracture is often accompanied by an acute reaction to bleeding or soft tissue damage at the fracture end. 3. Deformity. If the fracture is very obviously displaced or heavily crushed, this will result in deformity of the affected limb. 4. Bone rubbing sensation. If the fracture is heavily displaced, there will be an obvious sound of the fracture rubbing against each other when the fracture is pressed, which is called bone rubbing sensation. 5. Restriction of movement. When a fracture occurs, the patient will experience a significant restriction of movement. These are the unique clinical phenomena and characteristics of fractures.