HHNS only occurs when diabetes is uncontrolled. In order to avoid HHNS you have to check your blood sugar on a regular basis. Your doctor or a diabetes educator can help you with this: you may learn the techniques and the personal interpretation of results. If sick, you will check your blood sugar more often, and drink a glass of liquid every hour. You can build your sick day plan with your healthcare team.
Call your doctor or seek immediate medical care of you have signs or symptoms of HHNS.