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High blood sugar or glucose, also called hyperglycemia, occurs when there is too much sugar in the blood. High blood sugar is the primary symptom that underlies diabetes, but it can also occur in people who don’t have type 1 or type 2 diabetes, either because of stress or trauma, or gradually as a result of certain chronic conditions. It is important to manage high blood sugar, even if you don’t have diabetes, because elevated blood glucose can delay your ability to heal, increase your risk of infections, and cause irreversible damage to your nerves, blood vessels, and organs, such