Diabetes in pregnancy.
Diabetes can develop during pregnancy in a woman who hasn t previously had the condition.
It s called gestational diabetes and if it starts, it usually begins in the second half of pregnancy. In both types, the result is too much sugar in the blood. High blood sugar levels over the long term can cause many health problems. We don t know for sure what causes gestational diabetes, although it is thought that the hormones that you produce during pregnancy may block the action of insulin. As a result, your blood sugar levels can rise.