There can be a whole range of complications that will happen in patients with diabetes. To those patients who are suffering diabetes for a long time the nerve has been damage this damage causes the ability of the foot and legs to feel. Normally, if some damage happens such as a cut or knock or joint sprain, then the pain from it is felt and measures are taken to prevent any further damage. But in those with the nerve damage from the diabetes will not feel any damage that has happened and they continue to walk on them and make the damage worse. Combine this with the poor circulation, and then the diabetic foot is a problem.