Swollen feet in diabetic patients may be related to diabetic nephropathy, local infection, venous valve hypoplasia and other factors. 1. Diabetic nephropathy: because diabetes is a chronic disease, usually longer, when the patient’s high blood sugar triggered renal lesions, may lead to a large amount of albumin loss, plasma protein reduction, osmotic pressure drop and sodium retention, which may occur in the lower extremities, swelling, swelling of the feet and so on. 2. Localized infections: diabetic patients with severe conditions and poor control may lead to diabetic foot, if the patient’s feet appear localized ulcers, infections, etc., under the stimulation of inflammation may appear diabetic foot redness, swelling, hot and painful symptoms. 3. Venous valve hypoplasia: when the patient combined with lower limb venous valve hypoplasia, may lead to lower limb atherosclerosis, lower limb varicose veins and other diseases, resulting in obvious swelling or lower limb venous deep vein thrombosis, causing diabetic patients to have swollen feet. It is recommended that patients seek timely medical examination to clarify the cause of the targeted treatment, pay attention to rest in life, avoid strenuous exercise.