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High blood glucose is a condition known as hyperglycemia. This term is typically used in reference to diabetes, a disease in which hyperglycemia can often occur. However, everyone experiences high blood glucose sometimes.
Pre-Diabetes
People who have blood glucose levels higher than normal but not as high as people with diabetes might have a condition called pre-diabetes, according to the American Diabetes Association (ADA).
Features
Fasting glucose, which is measured when a person has not recently eaten, in a person with pre-diabetes is between 100 and 125 milligrams per deciliter (mg/dl), according to the ADA.
Diabetes
When someone's fasting glucose rises above 125 mg/dl, he is considered diabetic, according to the ADA.
Causes
In a person with diabetes, increased levels of blood glucose can indicate a lack of insulin in type 1, ineffectiveness of insulin in type 2, eating more or exercising less than planned, illness and stress.
Symptoms
Symptoms of hyperglycemia in a person with diabetes include urinating frequently, increase in thirst, blurry vision and being very tired, according to the Mayo Clinic.
Complications
Ketacidosis, or diabetic coma, can occur as a result of uncontrolled hyperglycemia. The ADA reports that the condition can be managed with diet and exercise and possiblly changes in medication .
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