Swelling after a sprain of the back of the foot, generally need 1-2 weeks to recover, the details are as follows, the majority of patients with a sprain of the back of the foot tendon and other soft tissue injuries, local vascular permeability will significantly increase, there will be swelling symptoms and pain in the short term, the symptoms are more obvious when walking with weight, most need to rest, affected limb braking and continuous cold compress treatment, after the above treatment swelling symptoms in 1-2 weeks will The swelling will recover completely in 1-2 weeks after the above treatment. The recovery is faster in younger patients, but in older patients, the recovery is prolonged due to slower blood circulation and narrowing of blood vessel diameter. Patients with instep sprains should be treated as soon as possible to avoid overly severe swelling, which can lead to a prolonged recovery period.