Diabetic neuropathy is a peripheral nerve disorder caused by diabetes or poor blood sugar control. The most common types of diabetic neuropathy result in problems with sensation in the feet. It can develop slowly after many years of diabetes or may occur early in the disease. The symptoms are numbness, pain, or tingling in the feet or lower legs. The pain can be intense and require treatment to relieve the discomfort. The loss of sensation in the feet may also increase the possibility that foot injuries will go unnoticed and develop into ulcers or lesions that become infected. In some cases, diabetic neuropathy can be associated with difficulty walking and some weakness in the foot muscles. There are other types of diabetic-related neuropathies that affect specific parts of the body. For example, diabetic amyotrophy causes pain, weakness and wasting of the thigh muscles, or cranial nerve infarcts that may result in double vision, a drooping eyelid, or dizziness. Diabetes can also affect the autonomic nerves that control blood pressure, the digestive tract, bladder function, and sexual organs. Problems with the autonomic nerves may cause lightheadedness, indigestion, diarrhea or constipation, difficulty with bladder control, and impotence.