cardiac autonomic neuropathy symptoms
Heart and circulatory system problems. Diabetic autonomic neuropathy may damage the nerves in the heart and circulatory system, causing a: 1  Sudden drop in blood pressure when you sit or stand up suddenly (orthostatic hypotension). 2  Rapid heart rate when you are not exercising (resting tachycardia). 3  Heart attack that causes no chest pain (silent heart attack).