Gestational diabetes, also known as gestational diabetes mellitus, GDM, or diabetes during pregnancy, is a type of diabetes that only pregnant women get. If a woman gets diabetes when she is pregnant, but never had it before, then she has gestational diabetes.
Normally, your stomach and intestines digest the carbohydrate in your food into a sugar called glucose. Glucose is your body’s main source of energy. After digestion, the glucose moves into your blood to give your body energy.
To get the glucose out of your blood and into the cells of your body, your pancreas makes a hormone called insulin. If you have diabetes, either your body doesn’t make enough insulin, or your cells can’t use it the way they should. Instead, the glucose builds up in your blood, causing diabetes, or high blood sugar.
Gestational diabetes happens in about 5 percent of all pregnancies, or about 200,000 cases a year in the United States.