Normal blood sugar levels are typically within 70 to 99 milligram of sugar per deciliter of blood while fasting, and below 140 mg/dL after eating. AdvertisementBlood tests can determine whether your blood sugar is high, and a growing number of wearables offer real-time updates on how your blood sugar levels change over time. While brief spikes of elevated blood sugar aren't necessarily cause for concern, chronic high blood sugar, or hyperglycemia, can develop into prediabetes or eventually type 2 diabetes. Unusual tiredness can be a warning of high blood sugarPotential symptoms of high blood sugar can be difficult to distinguish from other health issues — for example, high blood sugar can cause you to feel more tired than usual. Cuts that won't heal or frequent infections are a warning signDelayed healing is another hallmark of high blood sugar, according to Varughese.

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Persons: —, Mary Korytkowski, Libu, Varughese, Korytkowski, Barbara Eichorst Organizations: Service, CDC, University of Pittsburgh School of Medicine, Business, Aeroflow Diabetes, Health, American Diabetes Association