Type 1: Caused due to autoimmune (self) destruction of the beta cells in the pancreas. Beta cells of pancreas produce insulin which decreases blood glucose level. Absence of beta cells or destruction of pancreas results in increase in blood glucose level. Common in age group 30-40
Type 2: Consist of spectrum of destructions characterized by hyperglycemia (increased blood glucose level) resulting from combination of resistance to insulin action, decreased insulin secretion and excessive or inappropriate glucagon (hormone that increases glucose) secretion.