Gestational diabetes is a type of diabetes that happens during pregnancy; a hormone made by your placenta keeps your body from using the insulin as it should.
Prediabetes means that the level of sugar (glucose) in your blood is too high.
In type 1 diabetes, the body can’t make insulin. Insulin is needed to help glucose enter cells for energy. Without insulin, glucose builds up in the blood. This causes high blood glucose or high blood sugar.
When your body can’t make enough insulin or can’t use insulin, it is called type 2 diabetes - a chronic disease that has no known cure. It is the most common type of diabetes.