Foot problems most often happen when there is nerve damage, also called neuropathy. This can cause tingling, pain (burning or stinging), or weakness in the foot. It can also cause loss of feeling in the foot, so you can injure it and not know it. Poor blood flow or changes in the shape of your feet or toes may also cause problems.
Although it can hurt, diabetic nerve damage can also lessen your ability to feel pain, heat, and cold. Loss of feeling often means you may not feel a foot injury. It is possible have a tack or stone in your shoe and walk on it all day without knowing. You could get a blister and not feel it. A person with Neuropathy might not notice a foot injury until the skin breaks down and becomes infected.
Nerve damage can also lead to changes in the shape of your feet and toes.