High blood sugar, also known as hyperglycemia, is common in people who have diabetes.
If it’s left untreated, chronic hyperglycemia can lead to diabetes complications, such as nerve damage, eye disease and kidney damage.
Hyperglycemia usually means you have diabetes, and people with diabetes can experience hyperglycemia episodes frequently.
If you have hyperglycemia that’s untreated for long periods of time, it can damage your nerves, blood vessels, tissues and organs.
