Diabetes can significantly affect the health of the lower leg and foot. You are particularly at risk if you have suffered diabetes for a long time, your blood sugar is too high or you are a smoker. Problems are caused by compromised blood flow and nerve damage. Symptoms include numbness of the feet, ulcers, burning pains in the legs – particularly at night, swelling and redness of the feet and lower leg and tingling or pins and needles in the feet. Those with advanced diabetes may be in danger of lower limb amputation.