To determine whether the thumb is fractured, it is necessary to take into account the specific symptoms of the thumb injury and the results of imaging tests. 1. Symptoms: Compared with sprains, the pain of thumb fracture will be more intense, accompanied by tenderness and percussion pain, etc. In addition, there will be severe swelling and obvious bruising. In patients with fracture and dislocation, there will also be localized deformity of the thumb. 2. Imaging examination: X-ray and MRI can be used to determine the presence and severity of the fracture, as well as whether there is joint dislocation or displacement of the fracture. If the patient only has a sprained finger, the fracture line will not be seen in the imaging examination. It is recommended that patients with thumb injuries go to the hospital in time for relevant examinations to determine whether the fracture is a fracture or not, and carry out follow-up treatment under the guidance of the doctor.