There are many causes of ankle swelling all the time, such as idiopathic edema, which is mostly seen in women. Patients experience swelling of the ankle joints of both lower limbs, which is not related to body position and will disappear on its own after a period of time. Cardiogenic edema, if the patient has poor cardiac function, will also appear as lower limb edema, and the concavity will not rebound immediately after pressing with fingers. There is also edema caused by renal insufficiency and edema caused by systemic hypoproteinemia, which can lead to swelling of the ankle joint. If the lower limb soft tissue injury caused by acute trauma can also lead to swelling of the ankle joint, the foot must be elevated and braked to reduce the edema of the ankle.