Q:

What are high blood sugar levels?

A:

Quick Answer

Someone with high blood sugar has a higher-than-normal amount of glucose in the blood, states the American Diabetes Association. Blood sugar increases when someone does not make enough insulin or does not have a normal response to insulin.

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Full Answer

High blood sugar causes increased thirst, frequent urination and sugar in the urine, according to the American Diabetes Association. The medical term for this condition is hyperglycemia. Type 1 diabetics sometimes develop hyperglycemia if they do not take enough insulin. Patients with unmanaged type 2 diabetes can also develop hyperglycemia. Without treatment, hyperglycemia may lead to ketoacidosis, a serious condition that causes nausea, vomiting and shortness of breath; it can lead to a coma.

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