Hypoglycemia (Hyperinsulinemic)

What is Hypoglycemia (Hyperinsulinemic)?

Hypoglycemia means your blood sugar, also called glucose, drops too low. Your body needs glucose for energy. When levels fall below 70 mg/dL, you may feel shaky, confused, or weak.

Hyperinsulinemic hypoglycemia happens when your body makes too much insulin. Insulin is a hormone that moves sugar from your blood into your cells. Too much insulin causes your blood sugar to drop dangerously low. This condition is less common than other types of low blood sugar.

The condition can result from tumors in the pancreas, certain genetic disorders, or problems with insulin-producing cells. Understanding the root cause helps guide the right treatment approach. Early detection through blood testing can prevent serious complications like seizures or loss of consciousness.

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Symptoms

Shakiness or trembling, especially between meals or at night
Sweating or feeling clammy without physical activity
Rapid heartbeat or palpitations
Anxiety, nervousness, or irritability
Hunger, even after eating recently
Confusion, difficulty concentrating, or brain fog
Dizziness or lightheadedness
Blurred vision or visual changes
Weakness or fatigue that comes in episodes
Seizures or loss of consciousness in severe cases

Some people experience symptoms only during fasting or exercise. Others may have episodes multiple times per day. Young children may show different signs like unusual behavior or excessive sleepiness.

Causes and risk factors

Hyperinsulinemic hypoglycemia occurs when your pancreas produces too much insulin. An insulinoma is a rare tumor in the pancreas that releases excess insulin. Most insulinomas are benign, meaning they are not cancerous. Nesidioblastosis is another cause where insulin-producing cells grow abnormally. Certain genetic conditions can cause this overgrowth, especially in infants and children.

Some medications can trigger hyperinsulinemic hypoglycemia as a side effect. Sulfonylureas, used to treat type 2 diabetes, stimulate insulin release. Taking too much of these medications leads to low blood sugar. Rarely, people inject insulin intentionally or accidentally, causing dangerous drops in glucose. Gastric bypass surgery can sometimes cause excessive insulin production after eating. Your risk increases if you have a family history of pancreatic tumors or certain genetic syndromes.

How it's diagnosed

Doctors diagnose hyperinsulinemic hypoglycemia by measuring blood sugar and insulin levels together. The key test happens during a hypoglycemic episode. Your doctor looks for high insulin levels when your blood sugar is low. This pattern confirms your body is making too much insulin. Fasting tests help trigger hypoglycemia in a controlled medical setting. You may need to fast for up to 72 hours while doctors monitor your glucose and insulin.

Rite Aid offers fasting insulin testing through our preventive health service. You can add insulin testing to your blood panel to monitor your levels. Early detection helps identify the problem before symptoms become severe. If results show elevated insulin during low blood sugar, your doctor may order imaging tests. CT scans or MRIs can find tumors in the pancreas. Some cases require specialized testing at endocrinology centers.

Treatment options

Eat small, frequent meals throughout the day to prevent blood sugar drops
Choose complex carbohydrates with protein and healthy fats for stable glucose
Avoid simple sugars and refined carbohydrates that spike insulin
Carry fast-acting glucose tablets or juice for emergency low blood sugar
Diazoxide medication can reduce insulin production in some cases
Somatostatin analogs like octreotide may help control insulin release
Surgical removal of insulinomas offers a potential cure
Partial pancreatectomy may be needed for nesidioblastosis
Work with an endocrinologist who specializes in hormone disorders
Monitor blood sugar regularly with a glucose meter or continuous monitor

Frequently asked questions

Hyperinsulinemic hypoglycemia is caused specifically by too much insulin in your body. Regular hypoglycemia can have many causes including skipping meals, too much exercise, or alcohol. The hyperinsulinemic type requires specialized treatment targeting insulin production. Identifying the cause through blood testing helps determine the right approach.

Doctors measure your insulin and blood sugar levels at the same time during a low blood sugar episode. High insulin when glucose is low confirms hyperinsulinemic hypoglycemia. Many patients undergo supervised fasting for up to 72 hours to trigger symptoms. Additional tests like C-peptide and proinsulin help rule out injected insulin.

If caused by an insulinoma tumor, surgical removal often cures the condition. About 90% of insulinomas are benign and can be completely removed. Cases caused by nesidioblastosis may require partial pancreas removal. Genetic forms in children may improve with medication or dietary management.

Focus on small, frequent meals with protein, healthy fats, and complex carbohydrates. Avoid simple sugars and refined carbs that spike insulin production. Good choices include eggs, nuts, vegetables, whole grains, and lean proteins. Eating every 2 to 3 hours helps prevent blood sugar drops.

Yes, severely low blood sugar can cause seizures, loss of consciousness, or even death. The brain needs glucose to function properly. Repeated episodes of hypoglycemia can damage brain cells over time. Early diagnosis and treatment prevent these serious complications.

Yes, children can develop hyperinsulinemic hypoglycemia, often from genetic causes. Congenital hyperinsulinism appears in infancy and requires immediate treatment. Symptoms in children may include lethargy, poor feeding, or seizures. Genetic testing helps identify inherited forms of the condition.

Diazoxide is the most common medication and helps reduce insulin production. Somatostatin analogs like octreotide can also lower insulin release. Some patients need both medications for better control. Medication works best when combined with dietary changes and frequent blood sugar monitoring.

Test your blood sugar before meals, 2 hours after eating, and anytime you feel symptoms. Many people with hyperinsulinemic hypoglycemia test 4 to 6 times daily. Continuous glucose monitors provide real-time readings without finger pricks. Your doctor will recommend a testing schedule based on symptom severity.

Yes, some people develop post-bariatric hypoglycemia after gastric bypass surgery. The condition typically appears months to years after surgery. Changes in digestion cause rapid insulin spikes after eating. Treatment focuses on dietary modifications and sometimes medication or revision surgery.

An insulinoma is a rare tumor in the pancreas that produces excess insulin. These tumors occur in about 1 to 4 people per million each year. Most insulinomas are small, benign, and can be surgically removed. Imaging tests like CT scans or endoscopic ultrasound help locate the tumor.