The symptoms of swelling of the neck of the foot are mainly caused by the following reasons: First, it is caused by strain and cold, especially the excessive stress on the ankle area for a long time, which can easily lead to excessive squeezing of the internal cartilage, causing edema and the surrounding ligaments and joint capsule, and after excessive stretching, causing spasm and edema, which will stimulate the internal synovial membrane and cause synovial edema. This condition will stimulate the internal synovial membrane, resulting in synovial edema and increased fluid exudation, which can easily lead to significant swelling of the foot neck after cold exposure. Secondly, it can be seen in trauma, especially after trauma, causing damage to the ligaments and joint capsule around the ankle joint and damage to the internal cartilage and bone, which can cause obvious bruising and swelling symptoms. 3. Immune diseases of the ankle joint, such as rheumatoid arthritis and gouty arthritis, can cause swelling of the ankle joint after erosion of the ankle joint.