What causes high blood glucose (sugar)?

High blood glucose, or high blood sugar, is called hyperglycemia. It is when your blood glucose is above 180 mg/dL.

High blood glucose (hyperglycemia) may happen when you: 

  • eat too much food

  • take too little insulin or other diabetes medicines

  • are less active than usual

  • are stressed or more active than usual

This can happen slowly and may lead to a medical emergency if not taken care of.

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How will I feel when my blood glucose (sugar) is high?

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How do I treat high blood glucose (sugar)?