What blood sugar level can cause unconsciousness?
Severe hypoglycemia, when blood sugar drops below 70 mg/dL (or 3.9 mmol/L), can lead to serious symptoms including loss of consciousness and seizures. The lower the blood sugar goes beyond this threshold, the greater the risk.
When blood sugar falls to dangerously low Show Full Answer
What blood sugar level can cause unconsciousness?
Severe hypoglycemia, when blood sugar drops below 70 mg/dL (or 3.9 mmol/L), can lead to serious symptoms including loss of consciousness and seizures. The lower the blood sugar goes beyond this threshold, the greater the risk.
When blood sugar falls to dangerously low levels, the brain doesn't get enough glucose to function properly. This can progress from symptoms like dizziness and shaking to more severe effects like seizures, convulsions, or complete loss of consciousness.
If you or someone you know experiences loss of consciousness due to low blood sugar, this is a medical emergency requiring immediate care. Once hypoglycemia is treated and blood sugar levels are restored, consciousness typically returns.
It's important to monitor for warning signs of severe hypoglycemia, which can include:
- Dizziness and confusion
- Sweating and shaking
- Weakness
- Rapid heartbeat
- Anxiety
Night sweats, nightmares, or restless sleep can also signal that blood sugar is dropping too low during the night, even if you don't fully wake up.
November 27, 2025
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