Gestational diabetes is a temporary form of diabetes that develops in up to 8 percent of women during pregnancy. It occurs when a pregnant woman with no history of diabetes develops a certain level of high glucose (blood sugar).

There is no single cause for gestational diabetes. Most scientists believe that it is related to certain hormones produced during pregnancy and their effect on the glucose-controlling hormone insulin. Factors that increase the risk of developing gestational diabetes include obesity, family history, age and race.

Gestational diabetes usually occurs in the later months of pregnancy (third trimester) and can have no symptoms. A physician performs glucose tests to screen for the condition.

Treatment may include diet changes, exercise and possibly medication such as insulin injections.

Gestational diabetes can cause difficulties for the woman and fetus during pregnancy and delivery. In addition, it also places the mother and baby at risk for certain problems later in life. By taking steps to prevent gestational diabetes, the woman is lowering the risk for future health problems for herself and her baby.