To raise blood sugar levels quickly, eat or drink something containing about 15 grams of simple carbs for a quick boost to restore blood glucose.

• Frequent low blood sugar episodes can cause a potentially dangerous condition called hypoglycemia unawareness, where there are no warning signs until more severe symptoms, like shakiness and confusion, set in.

This article was medically reviewed by Scott Kaiser, MD, geriatrician and Director of Geriatric Cognitive Health for Pacific Neuroscience Institute at Providence Saint John’s Health Center in Santa Monica, California.

• Visit Insider’s Health Reference library for more advice.

Hypoglycemia is a condition where blood sugar levels drop too low and need to be restored fast. If the condition isn’t treated quickly, you risk symptoms and complications like shakiness, confusion, seizures, or even death.

Here’s what you need to know about the causes and symptoms of hypoglycemia and the safest ways to raise blood sugar quickly.

Causes of hypoglycemia

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A comprehensive guide to lower blood sugar and manage the condition

Typically, hypoglycemia is most common in people with diabetes. It can also be a side effect of diabetes treatments intended to manage blood sugar levels, says Evan Barnathan, MD, a family physician at Central Maine Healthcare in Lewiston, Maine.

Patients who don’t reliably eat three meals a day and still take blood sugar-lowering medicines are most susceptible to hypoglycemia, Barnathan says.

Barnathan says insulinoma, an insulin-secreting tumor, is another condition that may result in dangerously low blood sugar. Though less common, these 

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tumors on the pancreas cause an overproduction of insulin, which in turn causes blood sugar to drop too low.

Drinking excessive amounts of alcohol may cause hypoglycemia, as well. Normally, when you haven’t eaten and your blood sugar drops, your pancreas releases a hormone that triggers your liver to release stored glucose into your bloodstream, thus raising your blood sugar level. But if you drink excessively, your liver has to process the alcohol, which essentially blocks it from releasing glucose.

Other severe liver illnesses, hormone deficiencies, and long-term starvation can also result in hypoglycemia.