Edema in the neck of the feet may be caused by the following reasons: 1. Edema due to poor blood circulation in the lower limbs, often seen in patients who stand for a long time. There are many patients who need to stand for a long time and keep their posture still due to their work, and the blood circulation of the lower limbs will become poor at this time. In addition. The lower extremities are located in the lowermost part of the body, which itself is easy to produce some fluid accumulation, so after this condition, there will be obvious swelling around the ankle joint and foot. 2. Trauma around the ankle joint, ankle sprain and contusion is very likely to lead to obvious swelling around the ankle joint. 3. Internal diseases, there are many internal diseases such as heart failure, kidney failure, thyroid related diseases, all may lead to Lymphatic circulation obstruction is relatively uncommon under current health conditions, as such diseases are often due to infectious diseases, such as filariasis, which lead to obstruction of lymphatic flow in the lower extremities, followed by significant swelling around the ankle joint or the entire lower extremity.