Sprained feet have not been swelling may be caused by the injury itself, or may be due to vascular disease of the lower extremities. 1. The injury itself: most patients with sprains have relatively mild injuries and usually recover gradually within 1 to 2 weeks. If the edema does not subside after the foot is sprained, it may be due to the seriousness of the injury, resulting in extensive edema or adhesion of the soft tissues around the injury, affecting the normal function of the joints, resulting in prolonged localized blood flow obstacles at the site of the injury, and the symptom of edema that does not subside. 2. Lower extremity vascular disease: if the edema does not subside after the sprain, it may also be due to the combination of lower extremity vascular disease. Lower extremity vascular diseases may have abnormal function of lower extremity venous valves, increased venous pressure and other pathologic changes, causing slowing of blood flow or stagnation of blood, resulting in edema that does not subside. Common diseases include varicose veins of the lower limbs and deep vein thrombosis of the lower limbs. There may be other reasons why the swelling of twisted feet does not go down, so it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or therapy under the guidance of the doctor.