What is the difference between hyperglycemia and hypoglycemia?

Glycemia is the presence of sugar (glucose) in the blood. Hyperglycemia indicates excess glucose in the blood. Hypoglycemia refers to abnormally low presence of glucose in the blood.
Controlling blood glucose levels is the cornerstone of diabetes treatment. Using insulin injections and wisely consuming carbohydrates to maintain as stable and balanced blood glucose levels as possible keeps the body functioning properly and prevents long-term damage to vital organs. Monitoring your blood glucose to know whether the current levels are high or low is the only way to determine the appropriate treatment.
Sources:
https://www.rd.com/health/conditions/hyperglycemia-vs-hypoglycemia/

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Why is it important to monitor blood glucose levels?

Checking and monitoring your blood glucose (sugar) levels is very important in order to keep your diabetes under control, especially in patients on insulin and patients with type 1 diabetes. Learn how.
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What is hyperglycemia?

One has hyperglycemia, or high blood sugar, when they have excess glucose in the blood – a blood glucose level above 130 milligrams per deciliter (mg/dL) – and haven’t eaten for 8 hours.

What is hypoglycemia?

Hypoglycemia is low blood sugar (glucose) or a level of 70 milligrams per deciliter (mg/dL) or fewer, and symptoms can range from shakiness, nervousness, sweating, to hunger.

What is low blood glucose?

Low blood glucose, known as low blood sugar or hypoglycemia, is when your blood glucose levels fall below 70 mg/dL. Symptoms can set in quickly and include dizziness, anxiety, cold sweats and more.
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