Hypoglycaemia: Understanding Low Blood Sugar

Introduction

Hypoglycaemia is a medical condition in which blood glucose levels

 drop below the normal range required for the body—especially the

 brain—to function properly. It is most commonly associated with

 diabetes treatment but can also occur in people without diabetes due

 to certain illnesses, medications, or lifestyle factors. Early

 recognition and prompt management are essential to prevent serious

 complications.

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Definition

Hypoglycaemia refers to abnormally low blood glucose levels,

 typically below 70 mg/dL in people with diabetes. In individuals

 without diabetes, hypoglycemia is usually defined as blood glucose

below 55 mg/dL.

Risk Factors

Several factors increase the likelihood of developing hypoglycemia:

• Diabetes treatment (insulin or oral medications that increase insulin release).
• Skipping meals or inadequate carbohydrate intake.
• Excessive physical activity without adjusting food or medication.
• Alcohol consumption, especially without food.
• Older age, kidney disease, heart disease, or cognitive impairment.
• Certain medications (beta‑blockers, antibiotics, heart medications).
• Critical illness or organ failure.

Pathophysiology

Blood glucose levels are regulated by a balance between insulin and counter‑regulatory hormones such as glucagon, cortisol, epinephrine, and growth hormone. When glucose levels fall:

• The pancreas releases glucagon to raise blood sugar.
• The adrenal glands release epinephrine and cortisol.
• The pituitary gland releases growth hormone.

These hormones stimulate the liver to release stored glucose. If these mechanisms fail or are overwhelmed—such as during excessive insulin use—blood glucose drops dangerously low, impairing brain function.

How Hypoglycaemia Happens

Hypoglycemia occurs when glucose supply is insufficient or insulin levels are too high. Common mechanisms include:

• Excess insulin or diabetes medications lowering blood sugar too much.
• Not eating enough carbohydrates to match insulin levels.
• Increased physical activity causing muscles to use more glucose.
• Alcohol interfering with liver glucose release.
• Illness, vomiting, or inability to eat.
• Rare causes such as insulin‑producing tumors or post‑bariatric surgery.

Complications

If untreated, hypoglycaemia can progress from mild symptoms to severe, life‑threatening complications:

• Confusion and behavioural changes
• Loss of coordination and slurred speech
• Seizures
• Loss of consciousness
• Coma
• Brain injury due to prolonged glucose deprivation

Emergency Management at Home

Immediate action is crucial:

For Mild to Moderate Hypoglycemia

Use the 15‑15 rule:

1. Consume 15 grams of fast‑acting carbohydrates (e.g., glucose tablets, juice, regular soda).
2. Recheck blood sugar after 15 minutes.
3. Repeat if still below 70 mg/dL.

For Severe Hypoglycemia

• If the person is unable to swallow, unconscious, or having seizures:
• Do not give food or drink.
• Administer glucagon injection if available.
• Call emergency services immediately.

Emergency Management in Hospital

In a clinical setting, treatment includes:

• IV dextrose for rapid correction.
• Glucagon injection if IV access is delayed.
• Continuous monitoring of blood glucose.
• Identifying and treating underlying causes (medication adjustment, infection treatment, etc.).

Treatment

Treatment depends on severity and underlying cause:

• Immediate glucose replacement (oral or IV).
• Adjusting diabetes medications to prevent recurrence.
• Treating underlying medical conditions (kidney disease, liver disease, hormone deficiencies).
• Education on recognizing symptoms and preventing episodes.

Long‑Term Management

Long‑term strategies focus on preventing future episodes:

• Regular blood glucose monitoring.
• Eating balanced meals with adequate carbohydrates.
• Adjusting insulin doses during exercise or illness.
• Avoiding alcohol on an empty stomach.
• Using continuous glucose monitoring (CGM) for early alerts.
• Working with healthcare providers to tailor medication plans.

Conclusion

Hypoglycemia is a serious condition that requires prompt recognition and treatment. Understanding its causes, symptoms, and emergency management can prevent complications and improve quality of life—especially for individuals living with diabetes. With proper education, monitoring, and medical guidance, hypoglycemia can be effectively managed both at home and in clinical settings.

References

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3.     American Diabetes Association. Standards of Medical Care in Diabetes—2024. Diabetes Care. 2024;47(Suppl 1):S1‑S154.

4.     Kalra S, Gupta Y. Sulfonylureas and hypoglycemia. Indian J Endocrinol Metab. 2015;19(1):1‑4.

5.     Emanuele NV, Swade TF, Emanuele MA. Consequences of alcohol use in diabetics. Alcohol Health Res World. 1998;22(3):211‑9.

6.     Murad MH, Coto‑Yglesias F, et al. Drug‑induced hypoglycemia. Endocr Pract. 2009;15(5):463‑9.

7.     Arabi YM, et al. Hypoglycemia in critically ill patients. Crit Care. 2009;13(4):R126.

8.     Cryer PE. Mechanisms of hypoglycemia‑associated autonomic failure. N Engl J Med. 2013;369:362‑72.

9.     Service FJ. Hypoglycemic disorders. N Engl J Med. 1995;332:1144‑52.

10.  Rickels MR, et al. Emergency management of hypoglycemia. J Clin Endocrinol Metab. 2019;104(3):625‑35.

11.  Battelino T, et al. Clinical targets for continuous glucose monitoring. Diabetes Care. 2019;42(8):1593‑603.