Low Blood Sugar Is Not Just Hunger: Shaking, Racing Heart, and Confusion Need Action
Low blood sugar is not just “being hungry.”
For many people with diabetes, a reading below 70 mg/dL may count as low blood glucose, but individual targets can differ. The real danger is that very low glucose can affect brain function quickly.
The two dangerous mistakes are delaying treatment when symptoms are mild, and forcing food into the mouth of someone who cannot safely swallow.
What low blood sugar can feel like
NIDDK lists symptoms that can range from mild to severe.
Mild to moderate signs include:
- Shakiness.
- Hunger.
- Tiredness.
- Dizziness, lightheadedness, confusion, or irritability.
- Fast or irregular heartbeat.
- Headache.
- Trouble seeing or speaking clearly.
When glucose becomes very low, the brain may stop working as it should. A person may lose consciousness or have a seizure. Severe hypoglycemia is dangerous and needs immediate treatment.
Common triggers
Among people with diabetes, low blood glucose is common in people who use insulin or some medicines that increase insulin release.
Triggers include:
- Not eating enough carbohydrates or delaying meals.
- Fasting while continuing glucose-lowering medicines.
- More physical activity than usual.
- Drinking too much alcohol without enough food.
- Illness that prevents eating or keeping food down.
Mild to moderate: use fast carbohydrates
NIDDK recommends taking 15 to 20 grams of glucose or carbohydrates right away if blood glucose is below target or below 70 mg/dL.
Examples include:
- Glucose tablets or glucose gel.
- Half a cup of fruit juice.
- Half a can of regular soda, not diet soda.
- One tablespoon of sugar, honey, or corn syrup.
Wait 15 minutes and recheck. If still low, repeat. Once back in range, eat a small snack if the next meal is more than an hour away.
Fast glucose is the point. Chocolate, nuts, and a full meal are often too slow for the immediate fix.
Severe: do not force food
If someone is unconscious, seizing, confused enough that they cannot cooperate, or unable to swallow, do not force juice, candy, or food into their mouth. That can cause choking or aspiration.
Severe episodes may require glucagon and emergency help. People at risk should ask their clinician whether to keep a glucagon kit or nasal spray and teach family members how to use it.
If the person can swallow, treat with fast carbs. If they cannot swallow, treat it as an emergency.
This article corrects the definition, symptoms, triggers, and 15-to-20-gram fast-carbohydrate treatment principle using NIDDK’s Low Blood Glucose (Hypoglycemia) page. It is general health education, not medical advice. Diabetes medication and emergency plans should be discussed with a clinician.