If you have diabetes, you probably know the warning signs of low blood sugar, or hypoglycemia. "It's been described best as a little like the feeling you get when you're sliding on ice in a car: panic, rapid heart rate, [and] sort of a sense of doom," says John Buse, MD, PhD, professor of medicine, chief of the division of endocrinology, and executive associate dean for clinical research at the University of North Carolina at Chapel Hill School of Medicine.
You also probably know that hypoglycemia can come on suddenly and must be treated right away by eating sugar or carbohydrates. Other signs of hypoglycemia include dizziness, shakiness, difficulty paying attention, hunger, headaches, clumsy or jerky movements, and sudden moodiness like crying, according to the American Diabetes Association (ADA).
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But sometimes, people with low blood sugar don't get or even notice these warning symptoms. Instead, they develop a dangerous condition called hypoglycemic unawareness, which, in its worst form, can lead to unconsciousness, coma, or even death, though the latter is rare, Buse says. "Hypoglycemic unawareness is sort of a race," he says. "Will the patient figure out that they're hypoglycemic before they become incapacitated?"
Hypoglycemic unawareness occurs most often in insulin-treated people with type 1 diabetes but also happens in those with insulin-treated type 2 diabetes, says Buse. It's more common in pregnant women and in those who have had diabetes for a long time, according to the ADA.
In addition, "skipping or delaying a meal, increasing physical activity, or drinking alcohol can trigger an episode of low blood sugar," says Buse. "Even modest alcohol intake can bring it on."
Often, the very medicines used to treat diabetes can cause hypoglycemia and in turn lead to hypoglycemic unawareness. Under normal circumstances, as blood sugar plummets (less than 70 mg/dL of blood glucose is considered hypoglycemic), the body stops producing insulin and instead produces two other hormones: glucagon and epinephrine to help stabilize blood sugar. It's the epinephrine that causes the jittery "fight-or-flight" symptoms associated with hypoglycemia. But frequent episodes of low blood sugar dampen epinephrine, so warning signs are blunted or diminished.
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