Having high blood sugar, a situation also called hyperglycemia, means that there is too much glucose (sugar) in the blood, often due to a lack of insulin or the body’s inability to use insulin properly. (Insulin is a hormone that helps move glucose from the blood into the cells for energy.) For people who have diabetes, other factors can contribute to high blood sugar as well, such as eating too much carbohydrate, not getting enough physical activity, being sick or stressed, forgetting to take or not taking enough diabetes medication, or taking other medications that can raise blood sugar.
The downsides of high blood sugar
Hyperglycemia can cause immediate, or acute, side effects, including thirst, frequent urination, headaches, hunger, and blurry vision. It can also make you feel tired.
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