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The most common form of diabetes is Type 2 diabetes. This condition typically develops when the body becomes resistant to insulin, or when the pancreas fails to produce enough insulin, leading to elevated blood sugar levels. Type 2 diabetes is prevalent largely due to factors such as obesity, lack of physical activity, and poor diet, which are becoming increasingly widespread in many populations.

Gestational diabetes occurs during pregnancy and usually resolves after childbirth, making it less common compared to Type 2. Type 1 diabetes is an autoimmune condition typically diagnosed in childhood or young adulthood, where the body does not produce insulin at all. Type 3 diabetes is a term that is occasionally used to refer to insulin resistance associated with Alzheimer's disease or as a more general term for forms of diabetes not classified in the other types, but it is not widely recognized as a distinct type of diabetes in the way the other types are. Thus, Type 2 diabetes remains the most frequently diagnosed form in the general population.