During illness the body releases hormones which cause glucose to be released into the blood stream and increases the blood glucose level. These hormones also make the insulin less effective (insulin resistance).

This high blood glucose level, in combination with the illness, can lead to dehydration. If the body does not receive enough insulin and fluid it will start producing an alternative energy source known as ketones. This can then lead to diabetic ketoacidosis (DKA).

Sick day rules for pen therapy

Sick day rules for pump therapy