Gestational diabetes is an intolerance to glucose that first occurs, or is first detected, during pregnancy. Glucose is the main form of sugar in the body. Gestational diabetes occurs in 4% of all pregnancies.
Glucose is an important source of energy used by the body's cells. When a person eats, the pancreas normally makes extra insulin. The insulin causes the glucose in the blood to move inside the body's cells. In a woman with gestational diabetes, the hormones produced in pregnancy block the effects of insulin. Glucose then builds up in the blood and the cells are left without a main source of energy. The result is a high level of glucose in the blood, a condition known as hyperglycemia. High blood sugar levels can damage the growth of the fetus. This may cause complications for both the mother and baby.
The following conditions may increase a woman's chance of developing gestational diabetes: