What Is Blood Glucose–and What Makes It High or Low - Article Health

Before you had diabetes, your body was able to regulate itself. It didn’t matter what you ate or if you exercised. But with diabetes, your blood glucose (blood sugar) can be high or low. The food you eat, your physical activity, your medicines, and many other factors can cause your blood glucose to be higher or lower than your target range. It is important to try and keep your blood glucose in your target range to stay healthy and help prevent other health issues with your heart, feet, kidneys, and eyes.

Your diabetes care team will help you to set the target range for your blood glucose.

Managing high and low blood glucose
Many things can affect your blood glucose. Learning these things can help you manage your blood glucose.

Hyperglycemia (high blood glucose) happens when there is too much glucose (sugar) in your blood. Hypoglycemia (low blood glucose) is when your blood glucose levels go too low. This is usually less than 70 mg/dL on a meter. However, talk to your doctor about your own blood glucose targets and what is too low for you.

What are the causes of hyperglycemia?
Missing a dose of medicine
Eating more than usual
Exercising less than usual
Being stressed by being sick with a cold or the flu
Feeling stressed because of family conflicts, work, or other problems
What are the signs and symptoms of high blood glucose?
A blood glucose reading above your target range on a blood glucose meter
Frequent urination
Increased thirst
Blurry vision
Fatigue or unusual tiredness


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