Blood Sugar Danger Levels


Anything too far outside the normal range of 70 to 120 in a blood glucose test is considered a dangerous blood sugar level.

Diabetic blood level items
Diabetic blood level items (Image: Rade Pavlovic/iStock/Getty Images)

High Blood Sugar

Also known as hyperglycemia, high blood sugar levels are typically about 240 milligrams/deciliters. Any level above this can become dangerous.

Woman taking blood sugar level test
Woman taking blood sugar level test (Image: Christopher Pattberg/iStock/Getty Images)

Low Blood Sugar

Low blood sugar is known as hypoglycemia and is generally anything less than 70 milligrams/deciliters.

Woman testing blood sugar levels
Woman testing blood sugar levels (Image: Daniel Gale/iStock/Getty Images)

High Blood Sugar Symptoms

Oftentimes, hyperglycemia has no symptoms, but if they do occur, they are most commonly blurry vision, frequent urination, fatigue, persistent thirst and wounds that are slow to heal.

Woman holding head
Woman holding head (Image: Jacob Wackerhausen/iStock/Getty Images)

Low Blood Sugar Symptoms

Most people with low blood sugar experience shaking, nausea and feeling unusually weak and drowsy. With severely low blood sugar, fainting and seizures can occur.

Woman resting on couch
Woman resting on couch (Image: Wavebreakmedia Ltd/Wavebreak Media/Getty Images)


Blood sugar problems can be prevented by maintaining a healthy diet and getting an acceptable level of physical exercise.

Woman eating salad
Woman eating salad (Image: tetmc/iStock/Getty Images)

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