Written by the Doctobip Editorial Team. Educational information only — not medical advice. See our Medical Disclaimer.
Hypoglycemia — low blood sugar — is one of the most important things anyone with diabetes (and the people around them) should know how to recognize and treat. Handled fast, it’s usually a brief unpleasant episode. Ignored, it can become dangerous. Here’s the practical guide.
What counts as low blood sugar?
For most people with diabetes, hypoglycemia means a blood glucose below 70 mg/dL. Below 54 mg/dL is considered clinically significant and needs immediate action. Levels this low mostly occur in people using insulin or certain pills (like sulfonylureas) — see how lows fit the bigger picture in our blood sugar levels guide.
Warning signs
Early symptoms come from the body’s stress response:
- Shakiness, trembling
- Sweating and chills
- Fast heartbeat
- Sudden hunger
- Anxiety or irritability
- Dizziness or lightheadedness
If glucose keeps falling, the brain runs short on fuel: confusion, slurred speech, blurred vision, clumsiness, extreme drowsiness — and in severe cases, loss of consciousness or seizures.
The 15–15 rule: how to treat a low
- Eat or drink 15 grams of fast-acting carbs — glucose tablets (check the label), 4 oz (120 ml) of juice or regular soda, 1 tablespoon of honey or sugar
- Wait 15 minutes, then recheck your blood sugar
- Still below 70? Repeat with another 15 g
- Once back in range, eat a small snack with protein if your next meal is more than an hour away
Avoid chocolate or peanut butter as first-line treatment — their fat slows the sugar down.
Severe lows: when help is needed
If someone is unable to swallow safely, is unconscious, or is having a seizure: do not put food or drink in their mouth. This is what emergency glucagon (injection or nasal spray) is for — family and friends can learn to use it. Call emergency services if glucagon isn’t available or the person doesn’t recover quickly.
Preventing the next low
- Don’t skip or delay meals after taking insulin or medication
- Check (or watch your CGM) before driving and before/after exercise
- Plan for activity: exercise can lower glucose for hours afterward
- Be careful with alcohol, especially on an empty stomach
- Repeated lows? Tell your care team — medication doses may need adjusting
- Below 70 mg/dL = low. Treat it, don’t wait it out.
- Use the 15–15 rule: 15 g fast carbs, recheck in 15 minutes.
- Severe low with confusion or unconsciousness = glucagon + emergency help.
- Frequent lows are a signal to review your treatment plan.
Frequently asked questions
Can people without diabetes get hypoglycemia?
It’s uncommon but possible (reactive hypoglycemia, certain conditions). Recurrent symptoms deserve a medical evaluation.
What is hypoglycemia unawareness?
After many lows, some people stop feeling the early warning signs. CGM alarms and adjusted glucose targets help — discuss it with your care team.
Should I carry something at all times?
If you’re on insulin or sulfonylureas: yes. Glucose tablets are cheap, portable and measured.
References
- American Diabetes Association — Hypoglycemia (Low Blood Glucose)
- CDC — cdc.gov/diabetes: Low Blood Sugar
- NIDDK — niddk.nih.gov
Medical disclaimer: This article is for general education and is not a substitute for professional medical advice. Always follow the emergency plan agreed with your healthcare team.