<unk>  can be mild, recognized easily by the patient, and reversed with a small amount of carbohydrates eaten or drunk, or it may be severe enough to cause unconsciousness requiring intravenous dextrose or an injection of glucagon. Severe hypoglycemic unconsciousness is one form of<unk>  coma. A common medical definition of severe hypoglycemia is "hypoglycemia severe enough that the person needs assistance in dealing with it". A co-morbidity is the issue of hypoglycemia unawareness. Symptoms of<unk> , when they occur, are those of hypoglycemia: neuroglycopenic, adrenergic (that is, activating adrenergic receptors, resulting e.g. in fast heartbeat), and abdominal. Symptoms and effects can be mild, moderate or severe, depending on how low the glucose falls and a variety of other factors. It is rare but possible for<unk>  to result in brain damage or death. Indeed, an estimated 2–4% of deaths of people with type 1 diabetes mellitus have been attributed to hypoglycemia. In North America a mild episode of<unk>  is sometimes termed a "low" or an "insulin reaction," and in Europe a "hypo", although all of these terms are occasionally used interchangeably in North America, Europe, Australia and New Zealand. A severe episode is sometimes also referred to as "insulin shock". In a counter-intuitive manifestation, hypoglycemia can trigger a Somogyi effect, resulting in a rebounding high blood sugar or hyperglycemia.
Diabetic hypoglycemia
Reactive hypoglycemia
Idiopathic hypoglycemia
Ketotic hypoglycemia
Hyperinsulinemic hypoglycemia
Ketosis-prone diabetes
Stress hyperglycemia
Non-islet cell tumor hypoglycemia