Some people fracture, a few days later will be very painful may be related to infection, displacement, fracture stability deterioration and other reasons. 1. Infection: some people fracture broken end of the infection, body immunity, inflammation stimulation triggered by infection, infection will have obvious redness, swelling, heat and pain symptoms, more than the fracture at the beginning of the pain is more intense. 2. Displacement: some people fracture often walking, resulting in displacement of the fracture broken end, the same will be a few days after the fracture has a very painful feeling, it is recommended that the fracture needs to rest more, to avoid fracture displacement to increase the recovery period. 3. The stability of the fracture becomes worse: after the swelling of the broken end of the fracture subsides, the plaster is unstable and loosened, which makes the stability of the fracture worse, and the fracture will also have pain. Some people fracture, it will take a few days before the pain, it is recommended to go to the regular hospital in a timely manner to diagnose the cause of treatment.