How Diabetes Causes Foot Problems - Topic Overview
things work together to cause foot problems in people who have
diabetes, especially poor circulation and nerve
disease (neuropathy). Neuropathy significantly dulls awareness
of your feet, making you more susceptible to extensive injury-related damage.
Also, diabetes can impair your ability to heal by both damaging your immune system and decreasing the blood flow in your legs.
If your vision has been affected by
diabetic retinopathy or other eye problems, you may
not see an injury or infection in your feet early. If you get a foot infection or injury,
you may not notice it until your condition is so serious that you require
surgery, possibly amputation.
Who's at risk?
Things that increase your risk for diabetic foot
blood glucose control. If your blood sugar levels are persistently above the
target range, you are more likely to have foot problems.
- Age. The
risk increases with age.
- Gender. Males are at higher
- Race. African Americans, Hispanics, and Native Americans are
at higher risk.
- Duration of diabetes. The longer you have the
disease, the greater your risk.
- Other complications due to diabetes
(small blood vessel disease,
atherosclerosis of large vessels). If you already have
other diabetic complications, you are more likely to have foot
- Smoking. Smoking contributes to circulatory problems in
your extremities, increasing your likelihood of developing foot
- Peripheral neuropathy (damage to the nerves that control
sensation and touch). Peripheral neuropathy results in poor sensation in your
extremities, increasing your likelihood of having foot problems.
- Alcohol dependence. Long-term heavy drinking can cause numbness and tingling in your hands and feet.
How do problems start?
Because foot disease in
diabetes usually begins with neuropathy, your first step in preventing foot
problems should be addressing problems with your nerves. Neuropathy causes
problems in your feet by disrupting your nerves, both reducing your sensation
of pain and causing problems with the way you walk. Such problems can damage
your feet in the following ways:
- Reduced sensation prevents you from sensing
pain and realizing that your foot has been injured. Poor eyesight can also
reduce your ability to detect foot injuries and infections. For example, you
may have a blister and not realize it because you don't feel any pain from it or see the blister. Without treatment, this injury may progress to
- Your feet are at
risk for problems that arise from poor muscular control. If your nerves are no
longer able to carry signals that mean the appropriate motion of your feet
and lower legs while you walk, your body may compensate by forcing your feet to
adopt unnatural positions while you move. Changing the way you walk increases
your risk of getting foot ulcers and deformities. Your feet may become deformed
and misshapen if you walk abnormally for an extended period of time. In fact,
about half of all people with diabetes have a
hammer toe or claw toe deformity or a
Charcot foot deformity, caused by an abnormal walk.
See a picture of
Charcot foot .