Hyperosmolar means your blood is too concentrated. Hyperglycemic means your blood sugar is too high.
HHS is caused by very high blood sugar levels, usually in people with type 2 diabetes. People with type 1 diabetes don't usually get HHS. They may get diabetic ketoacidosis instead. The extremely high levels of blood sugar cause you to pass much more urine than usual. This causes severe dehydration and makes your blood more concentrated.
You're more likely to get HHS if you have type 2 diabetes and you:
The first symptoms are:
If not treated early, you may also have:
Doctors treat you in the hospital with:
Fluids and electrolytes (minerals necessary to make your body work normally) into your vein
Insulin into your vein
Frequent blood tests to make sure your blood sugar and electrolytes are going back to normal
Doctors also treat whatever other problem caused the HHS.