Diabetes is an illness that affects your blood sugar. When you have diabetes, you have to make sure your blood sugar does not get too high or too low. If your sugar gets out of balance, you may feel dizzy, sleepy or confused. You may have blurred vision or lose consciousness. Diabetes can also cause nerve damage in your hands, legs, and feet. However, if it is managed well, diabetes doesn’t have to cause a problem when driving. If you are unsure, ask your doctor.