Hypoglycemia unawareness is characterized by which of the following?

• A. Heightened autonomic symptoms during hypoglycemia
• B. Loss of autonomic symptoms due to impaired counterregulation, increasing risk of severe hypoglycemia.
• C. Hypoglycemia unawareness decreases risk of severe hypoglycemia
• D. It only occurs after prolonged hyperglycemia

Answer: (B)

Hypoglycemia unawareness is about losing the warning signals your body normally sends when glucose drops. When glucose falls, the body normally triggers autonomic symptoms (like sweating, shakiness, palpitations) and mounts counterregulatory responses (glucagon and epinephrine) to raise blood sugar and prompt you to treat it. In hypoglycemia unawareness, these warning cues are blunted because the counterregulatory system isn’t responding normally. That means you don’t notice the danger early, so you’re at a higher risk of slipping into severe hypoglycemia before you can act.

That’s why the best choice describes a loss of autonomic symptoms due to impaired counterregulation, which in turn raises the risk of severe hypoglycemia. The other ideas don’t fit: the condition isn’t characterized by heightened autonomic symptoms; it doesn’t reduce risk—in fact, it increases risk; and it isn’t tied to prolonged hyperglycemia as the defining trigger.