The swelling of a sprained foot that has been walking for 3 months should be analyzed according to the specific problem. If the swelling is not accompanied by pain or restricted activity, but simply swelling, and the swelling will be reduced after rest and elevation of the affected limb, there is no need to worry about this situation and only further recovery is needed. This is due to the atrophy of local veins caused by traumatic braking and resting, and the restriction of blood return, which can lead to blood stagnation and swelling due to walking and gravity. In this case, the elasticity of the vein is restored and the symptoms disappear. If the swelling is severe, you can take oral medications to improve the venous dynamics, such as Mizarin, Veritin, etc. If the swelling is accompanied by pain and limited movement, a re-examination at the hospital is needed to find other injuries that were not detected during the first visit or to find out how the injury is being repaired.