There are many causes of ankle swelling in the elderly, including physiological factors, local factors, systemic factors and nutritional factors. 1. Physiological factors: such as prolonged standing, squatting, walking, etc., will lead to swelling of the ankles, this physiological factor caused by the symptoms can be relieved after rest. 2. Local factors: such as trauma, surgery, infection, etc., resulting in local inflammatory reaction, or lower extremity venous valve function decline, thrombosis, etc., resulting in venous blockage and lymphatic reflux obstruction. 3. Systemic factors: such as heart failure, pulmonary heart disease, cirrhosis, liver failure, acute and chronic nephritis, kidney disease and other systemic diseases, may cause ankle swelling. 4. Nutritional factors: when the elderly are malnourished, plasma albumin decreases, leading to a decrease in plasma colloid osmotic pressure, and ankle swelling can occur. There are many reasons that can lead to ankle swelling in the elderly, when the symptoms can not be relieved by rest, or even pain and other symptoms, you should consult a doctor in a timely manner to clarify the cause of the disease and receive appropriate treatment.