Swelling of lower limbs caused by diabetes may be caused by venous embolism, organ or systemic diseases, etc. according to the situation, as follows: 1. Swelling of one limb may be caused by venous thrombosis of lower limbs, venous ultrasound and arterial ultrasound should be checked, and timely treatment should be carried out according to the principles of venous thrombosis treatment after diagnosis; 2. Swelling of bilateral limbs may exist in cardiovascular pathologies such as cardiac insufficiency, liver pathologies such as chronic liver cirrhosis, kidney pathologies, Systemic malnutrition, hypoproteinemia, etc. The treatment for swelling is simple, and the cause of the swelling should be identified first and treated according to the cause. Once the swelling of the lower extremities occurs, the patient should be treated as soon as possible, so that the condition can be well relieved.