This is caused by the total destruction of beta cells of Beta cells of pancreas, which results in absolute deficiency of insulin. This is more commonly seen in children and young people. These patients need daily insulin injection which is essential for remaining healthy.
This is caused by insufficient action and relative lack of insulin in the body. Usually seen in older people but over weight children can also develop this diabetes. This diabetes can usually be controlled by diet, exercise and oral tablets. But sometimes insulin injection may be needed for sugar control.
This is the diabetes detected for the first time during pregnancy and disappears after delivery.
The diabetes caused by pancreatic stones, other hormonal disorders etc. are called secondary diabetes.