Elevated levels of ketone bodies in the blood decrease the blood’s pH, leading to diabetic keto acidosis.
Ketoacidosis can easily become severe enough to cause hypertension, shock, and death
More common in type I diabetes than type II.
Hyperglycemia hyperosmolar state
This results in loss of water and an increase in blood osmolarity.
If fluid is not replaced (by mouth or intravenous), the osmotic effect of high glucose levels, combined with the loss of water, will eventually lead to dehydration.
Lethargy may ultimately progress to coma, though this is more common in type II diabetes than type I.
Hypoglycemia
Hypoglycemia, is abnormally low blood glucose
Severe hypoglycaemia may lead to loss of consciousness leading to coma, seizures, or even brain damage and death