An Overview of the Symptoms of Hyperglycemia Hyperglycemia (high blood sugar) is a condition that typically occurs when the amount of glucose in the blood is too high. Although hyperglycemia usually affects diabetics, it can also occur in people without diabetes or other underlying conditions. Some of the main factors that can cause hyperglycemia in people with diabetes include illness, changes in physical activity and diet, not taking enough or skipping glucose-lowering drugs, or non-diabetes medication. Hyperglycemia needs immediate medical attention because if uncontrolled, it can easily lead to a wide range of life-threatening complications,…