Swollen ankles often need to exclude the edema caused by internal diseases, but also may be caused by standing for a long time the lower limbs of poor blood circulation, lower limbs of vascular lesions, ankle trauma. 1. Edema caused by internal diseases: like kidney edema, cardiogenic edema, hepatic edema, all of which can cause lower limb edema. 2. Poor blood circulation in the lower limbs caused by standing for a long time: this is not a pathologic manifestation, and is related to poor blood circulation in the lower limbs caused by standing for a long time, which can be improved after changing bad habits. 3. Lower extremity vascular lesions: such as lower extremity varicose veins, lower extremity arteriosclerosis and other lesions, due to poor blood circulation, can also cause ankle edema. 4. Ankle trauma: For example, a recent ankle fracture or ankle ligament sprain can cause ankle edema with later weight bearing and activities. Frequent edema of the ankle joint, especially without obvious causes, must be timely in the hospital, and targeted to improve the examination, a clear diagnosis, and then follow the doctor’s instructions for treatment.