Swollen ankles may be caused by diseases such as tenosynovitis, such as long-term heavy physical labor or strenuous sports, which may cause damage to the ankle joint, and may cause swelling of the ankle joint, especially after exertion, and the symptoms may be relieved after rest. Patients suffering from varicose veins of the lower limbs or lower limb vein thrombosis may also have swollen ankles, which may be caused by poor venous reflux in the lower limbs, prolonged standing or physical labor. If the symptoms still do not improve, it is necessary to go to the hospital for ankle MRI and lower extremity vascular ultrasound for clear diagnosis and targeted treatment according to the cause.