Diabetic neuropathy is considered a "forgotten complication" because physicians, other health care providers and patients themselves do not pay sufficient attention to its diagnostics. In my country, Ukraine, in the vast majority of cases, diabetic neuropathy is diagnosed in the presence of painful neuropathy (and, unfortunately, in many cases when the pain is quite severe). If patients do not complain about pain, the tests to diagnose diabetic neuropathy are very rarely done, even those that are very simple, such as assessment of tactile or vibration sensation, for instance. The term "forgotten complication" could be even more firmly applied to diabetic autonomic neuropathy, which may affect all parts of the autonomic nervous system and lead to very grave consequences, including sudden cardiac death and increased cardiovascular morbidity and mortality. And, of course, very little attention in clinical practice is paid to the brain damage in patients with diabetes mellitus.