If you have diabetes, your blood glucose, or blood sugar,
levels are too high. Over time, this can damage your nerves or blood
vessels. Nerve damage from diabetes can cause you to lose feeling in
your feet. You may not feel a cut, a blister or a sore. Foot injuries
such as these can cause ulcers and infections. Serious cases may even
lead to amputation. Damage to the blood vessels can also mean that your
feet do not get enough blood and oxygen. It is harder for your foot to
heal, if you do get a sore or infection.