There are three main types of diabetes
Type 1 diabetes (T1DM)
It is usually diagnosed in children and young adults. Exact causes are still unknown, though recent researches revealed that it is mostly caused by an auto-immune reaction resulting in the destruction of Beta Cells which produce Insulin leading to total Insulin deficiency, so the only treatment are the insulin injections. The onset of type 1 diabetes is usually sudden and dramatic.
Type 2 diabetes (T2DM)
Is the most common type of diabetes (90-95%) and occurs mostly in the adult population who has a genetic risk factors coupled with being overweight. In this type the body either does not produce enough insulin or the cells do not utilize the insulin properly. It is treated initially by meal planning and exercise. If that is not enough to control it then medications will be added. The symptoms can often be mild or even absent in people with type 2 diabetes.
Gestational diabetes (GDM)
It is a form of diabetes that develops during the last part of pregnancy in a female that was not a person with diabetes prior to her starting her pregnancy. It is marked by high blood glucose levels during pregnancy. GDM usually disappears after pregnancy but women with GDM and their offspring are at an increased risk of developing type 2 diabetes later in life.