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Low blood sugar can be dangerous even when a person with diabetes feels no warning symptoms. Repeated lows can weaken awareness, and glucose can fall during sleep. Knowing the signs, treating an alert person promptly, and getting help for severe symptoms are essential; recurring episodes should prompt a review with the diabetes care team.
What counts as low blood sugar?
For many people with diabetes, blood glucose below 70 mg/dL (3.9 mmol/L) is considered low. The American Diabetes Association (ADA) classifies a reading from 54 mg/dL (3.0 mmol/L) up to, but not including, 70 mg/dL as level 1 hypoglycemia; below 54 mg/dL is level 2. Level 3 means severe hypoglycemia requiring another person’s assistance, regardless of the measured glucose. These categories describe severity; a person’s own threshold and treatment plan may differ, so discuss individualized targets with a clinician. ADA, Standards of Care in Diabetes—2026; NIDDK, Low Blood Glucose.
Why can a low become a hidden danger?
Warning symptoms are not guaranteed
Low glucose may cause shakiness, sweating, hunger, irritability, dizziness, a fast heartbeat, or confusion, but symptoms vary and may be subtle or absent. Repeated hypoglycemia or long-standing diabetes can impair the body’s ability to recognize a drop—a problem often called hypoglycemia unawareness. A person who does not notice a low may not treat it before it becomes severe. NIDDK; ADA.
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Lows can happen during sleep
Glucose can drop overnight. Someone who is asleep cannot respond to symptoms in the same way as when awake, and impaired awareness can make the risk harder to detect. Ask the diabetes care team whether and when to check glucose overnight, particularly if there have been nighttime lows or a change in routine. Continuous glucose monitoring (CGM) may be worth discussing for people with frequent lows or impaired awareness; it is not a universal requirement. NIDDK; ADA.
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How common it is depends on the group and the measure
NIDDK reports that a large global study found at least one low blood sugar event in a four-week period among 4 in 5 people with type 1 diabetes and nearly half of people with type 2 diabetes who use insulin. Separately, NIDDK estimates that 2 in 100 U.S. adults with diabetes taking insulin or certain medicines that prompt insulin release may develop severely low blood glucose each year. The ADA says the average person with type 1 diabetes has symptomatic low blood glucose up to twice a week; that figure concerns episodes with symptoms, not all measured lows. The populations, time windows, and definitions differ, so these figures should not be compared as if they measured the same thing. NIDDK; ADA.
Why do people with diabetes have lows?
Medication is a major factor, but a low often reflects the interaction between treatment and what is happening that day. Insulin and some medicines that stimulate insulin release—including sulfonylureas and meglitinides—can lower glucose. Other contributors include:
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- Skipping or delaying a meal, eating fewer carbohydrates than expected, or fasting while continuing glucose-lowering medicine.
- More physical activity than usual; exercise can affect glucose for hours afterward.
- Alcohol without enough food.
- Illness that reduces appetite or food intake.
Risk also depends on a person’s health and treatment circumstances. NIDDK identifies type 1 diabetes, insulin or certain other glucose-lowering medicines, age 65 or older, previous lows, and conditions such as kidney disease, heart disease, or cognitive impairment as risk factors. NIDDK; ADA.
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If the person is awake and can swallow safely
The CDC’s 15-15 rule is to take 15 grams of fast-acting carbohydrate, wait 15 minutes, then check glucose again. If it is still below 70 mg/dL, repeat the treatment and recheck after another 15 minutes. Follow personal clinician instructions if they differ; children may need a different amount. CDC, Treatment of Low Blood Sugar.
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CDC lists glucose tablets or gel, juice, regular (not diet) soda, sugar, honey, and syrup as options. Glucose tablets or gel are practical to keep nearby. Foods high in fat or fiber, and high-protein foods, are not ideal initial treatments because they may act more slowly than fast-acting glucose or carbohydrate. CDC; ADA.
If the person cannot self-treat or swallow safely
Do not give food or drink by mouth to someone who is unconscious, having a seizure, or otherwise unable to swallow safely. Severe hypoglycemia is an emergency: use the person’s prescribed glucagon according to its instructions, and seek emergency medical help. Family, friends, and caregivers should know where glucagon is kept and how to use it. CDC; ADA, Standards of Care in Diabetes—2026; NIDDK.
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| Situation | Appropriate response | Key distinction |
|---|---|---|
| Awake and able to swallow | Fast-acting carbohydrate; follow the 15-15 rule and recheck. | Oral treatment is for someone who can safely swallow. |
| Unable to self-treat or swallow safely | Caregiver uses prescribed glucagon and seeks emergency medical help. | Do not give food or drink by mouth. |
| Frequent lows or impaired awareness | Review glucose records and the treatment plan with the diabetes care team; discuss whether CGM could help. | Monitoring can help identify patterns, but it does not replace an individualized plan. |
How to reduce the chance of another low
- Review glucose readings alongside medication timing, meals, activity, alcohol, illness, and symptoms to look for patterns.
- Ask the diabetes team when to check glucose, including around exercise, overnight, or when routines change.
- Carry a fast-acting carbohydrate such as glucose tablets.
- Discuss CGM if lows are frequent or warning symptoms are unreliable.
Do not change or skip prescribed diabetes medicine on your own to prevent lows. Share recurring patterns with the clinician managing your diabetes so changes, if needed, can be made safely. NIDDK; ADA.
When recurring lows call for a treatment-plan review
Bring glucose records and note when lows occur in relation to medication, meals, activity, sleep, and illness. The ADA recommends evaluating a person’s history of hypoglycemia and treatment. Recurrent level 2 episodes—glucose below 54 mg/dL—or any level 3 episode requiring another person’s help call for prompt intervention and reconsideration of the diabetes treatment plan. The care team can assess treatment, behaviors, diabetes education and support, and whether technology could help prevent or identify lows. ADA, Standards of Care in Diabetes—2026.
Quick Recap
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- HSA/FSA eligible. No prescription needed.
- 24/7 GLUCOSE TRACKING. See your glucose response to food, exercise, sleep, and other lifestyle factors via the Lingo app.
- OPTIMIZE YOUR NUTRITION. Discover which foods work for you and those that don't. The Lingo app shows you how specific meals and other factors impact your glucose, so you can learn from your insights and build healthier habits
- NAVIGATE PREDIABETES WITH A NEW VIEW OF YOU. More time in healthy glucose range is linked to lower diabetes risk. Three out of four users with prediabetes say Lingo was effective in helping to achieve their health goals¹.
- HEALTHY GLUCOSE SUPPORTS HEART HEALTH. What you eat matters to your glucose and your heart. Keeping your glucose in a healthy range (70–140 mg/dL) more often can help protect your heart from heart disease²⁻⁴.
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