The time it takes for the swelling of a sprained foot to go down is closely related to the degree of the sprain and the level of care, which usually takes 3 to 7 days. Some severe ones take about two weeks. After a foot sprain, if there is no serious ligament damage, and timely elevation of the foot and braking, ice within 72 hours, heat after 72 hours, early treatment is better, may be 3~5 days to reduce swelling. If the sprain is not promptly braked and iced, the swelling will be slower and may take about 7 days. If the sprain is accompanied by serious ligament damage, or if you over-exercise when the swelling has not subsided, it may aggravate the local congestion and swelling, and the time for swelling to subside will be greater than 7 days, and it will take about two weeks or even more. After a sprained foot should be under the guidance of the doctor, according to the recovery situation, appropriate start rehabilitation exercise, help reduce swelling and recovery. If the ligament damage is severe, surgery may be required. If the pain after a foot sprain is severe or the pain cannot be relieved, you should go to the hospital in time and be treated under the guidance of your doctor.