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Moderate to severe high blood sugar. If your blood sugar levels are consistently high (usually above 350 mg/dL in adults and above 240 mg/dL in children), you may have moderate to severe symptoms of high blood sugar. These symptoms include: 1  Blurred vision.2  Extreme thirst. 3  Lightheadedness.oderate to severe high blood sugar. If your blood sugar levels are consistently high (usually above 350 mg/dL in adults and above 240 mg/dL in children), you may have moderate to severe symptoms of high blood sugar. These symptoms include: 1  Blurred vision.
Blood sugar spikes are sudden and relatively large increases in an individual's blood sugar levels. People generally experience spikes in their blood sugar after eating, especially if the meal was particularly sweet.Although spikes normally go beyond the usual blood sugar threshold of 180 milligrams per deciliter (mg/dL), those that measure 350mg/dL or more are considered to be dangerous.eople generally experience spikes in their blood sugar after eating, especially if the meal was particularly sweet. Although spikes normally go beyond the usual blood sugar threshold of 180 milligrams per deciliter (mg/dL), those that measure 350mg/dL or more are considered to be dangerous.