What is hypoglycemia?

The body's most important fuel is glucose, a type of sugar. When you digest most foods, sugar is released, and that sugar ends up in your bloodstream as glucose. Your body, particularly your brain and nervous system, needs a certain level of glucose to function — not too much, and not too little. If your blood glucose level isn't right, your body will react by showing certain symptoms.

Hypoglycemia occurs when a person's blood sugar levels are abnormally low, and it's a potentially serious condition. If you know someone who has diabetes, you may have heard them talk about "insulin shock," which is the common name for a severe hypoglycemic reaction. People with diabetes may experience hypoglycemia if they don't eat enough or if they take too much insulin — the medicine most commonly used to treat diabetes in kids.

What Are the Symptoms of Hypoglycemia?

Some symptoms of hypoglycemia are caused when the body releases extra adrenaline (epinephrine), a hormone that raises blood sugar levels, into the bloodstream to protect against hypoglycemia. High blood levels of adrenaline can make the skin become pale and sweaty, and a person can also have symptoms such as shakiness, anxiety, and heart palpitations (a fast, pounding heartbeat).

Other symptoms of hypoglycemia are caused when not enough glucose gets to the brain; in fact, the brain is the organ that suffers most significantly and most rapidly when there's a drop in blood sugar. These symptoms include headache, extreme hunger, blurry or double vision, fatigue, and weakness.*

Source: The American Diabetes Association, U.S. National Library of Medicine (NLM)