The swollen neck of the foot in children is mainly due to the following reasons: firstly, it is caused by a sprain of the ankle, and after a serious sprain of the ankle, it will cause swelling and pain in the neck of the foot, which can be treated with cold compresses in time; secondly, it is caused by rheumatic fever in children, which will also cause swelling of the neck of the foot, and the knee joint in children is often red, swollen and painful. The anti-O level of children is often very high, which requires the timely application of non-steroidal anti-inflammatory drugs to children for treatment, and can be relieved by the application of drugs to clear heat and dampness, such as the application of Phellodendron and Atractylodes.