Diabetes insipidus
It's got nothing to do with blood sugar
-Diabetes insipidus and diabetes mellitus are not related. Those with diabetes insipidus have normal blood glucose levels. They are both called diabetes, because people with both conditions usually produce a lot of urine.
In the case of diabetes insipidus, the lack of a hormone from the pituitary gland near the brain causes an abnormally large amount of urine to flow through the kidneys. As a result, a person with diabetes insipidus may drink large amounts of liquids due to excessive thirst and dehydration.
