Patients with a left lateral ankle fracture who have symptoms of swelling and tightness at the fracture site after the removal of the cast should be differentiated as to whether it is normal or not, with the following distinctions: In general, after the patient removes the cast, he tends to sit and stand for a long time or get down on crutches. As the patient was previously bedridden for a long time, keep the left foot elevated, and at this time suddenly make the left foot in the down position, may make the left foot due to the blood return restriction, followed by the above symptoms. This is normal and will be relieved after 2~3 days. Some patients do not follow the doctor’s advice after the removal of the cast and go down to the ground too soon for weight-bearing activities, which may lead to secondary damage to the fracture site, and then cause serious swelling symptoms. This is not normal. In addition, a very small number of patients may develop a localized infection during recovery, such as septic osteomyelitis, and subsequently develop swelling symptoms. Given the uncertainty of these symptoms, it is recommended that the patient return to the orthopedic surgeon at this time to determine if the condition is pathologic. Until then, the patient should not use the left foot for weight bearing.