Hyperglycemia is an abnormally high blood glucose (blood sugar) level.
Hyperglycemia is a hallmark sign of diabetes (both type 1 diabetes and type 2 diabetes) and prediabetes.
Diabetes is the most common cause of hyperglycemia.
Other conditions that can cause hyperglycemia are pancreatitis, Cushing's syndrome, unusual hormone-secreting tumors, pancreatic cancer, certain medications, and severe illnesses.
The main symptoms of hyperglycemia are increased thirst and a frequent need to urinate.
Severely elevated glucose levels can result in a medical emergency like diabetic ketoacidosis (DKA) or hyperglycemic hyperosmolar nonketotic syndrome (HHNS, also referred to as hyperglycemic hyperosmolar state).
Insulin is the treatment of choice for people with type 1 diabetes and for life-threatening increases in glucose levels.
People with type 2 diabetes may be managed with a combination of different oral and injectable medications.
Hyperglycemia due to medical conditions other than diabetes is generally treated by treating the underlying condition responsible for the elevated glucose.