Autoimmune Hypoglycemia - Types, Causes, Symptoms, Diagnosis, and Treatment

What Is Autoimmune Hypoglycemia?

Autoimmune hypoglycemia occurs when your body gets confused and starts making antibodies that attack your own insulin. You know how insulin helps control your blood sugar by storing extra sugar when levels get too high? When these antibodies mess with your insulin, it goes into overdrive, dropping your blood sugar way too low.

This condition usually appears in adults and goes by another name: autoimmune insulin syndrome, or Hirata disease. It is rare, but if you are dealing with unexplained low blood sugar, it might be worth checking out.

What Are the Types of Autoimmune Hypoglycemia?

If you are dealing with autoimmune hypoglycemia, you will encounter two main types:

• Insulin Autoimmune Syndrome (IAS), or Hirata's Disease:

With this one, your body produces way too much insulin and creates antibodies that attack your own insulin. You will likely experience severe drops in blood sugar after meals, which can be scary.

• Type B Insulin Resistance Syndrome (TBIRS):

This one is rare. Your body makes antibodies that mess with your insulin receptors (IRAbs). This creates a real rollercoaster for your blood sugar control. Sometimes you will have dangerously low blood sugar, and other times you will swing to the opposite extreme with super high blood sugar that won't respond to insulin at all.

What Are the Causes of Autoimmune Hypoglycemia?

If you have insulin autoimmune syndrome, your body produces high levels of insulin along with autoantibodies. You have never even been exposed to insulin injections.

Certain medications containing sulfhydryl groups can trigger your body to produce insulin autoantibodies (IAAs). Here are some common causes you should know about:

• Alpha-lipoic acid (ALA) (you will find this in many dietary supplements).
• Methimazole (if you are taking this for Graves' disease, keep an eye out).
• Captopril, an ACE (angiotensin-converting enzyme) inhibitor, could be a trigger.
• Penicillamine (disease-modifying antirheumatic drug).

Now, if you are dealing with other autoimmune conditions, you might be more susceptible. Graves' disease is the most common link, but you could also see connections with systemic lupus erythematosus (SLE) or Hashimoto's thyroiditis (both are autoimmune diseases).

There is also a condition called type B insulin resistance, in which your body produces antibodies against insulin receptors. These antibodies basically hijack your insulin receptors and make them act as if insulin is present when it is not.

Certain infections might set things off, too. If you have had measles (viral infection), influenza (viral infection), or hepatitis C (liver infection), these viruses have been linked to triggering the syndrome in some people.

What Are the Symptoms of Autoimmune Hypoglycemia?

If you are dealing with autoimmune hypoglycemia, you might experience:

With Insulin Autoimmune Syndrome:

• Autoimmune Antibody Positivity:

Your body creates antibodies that mistakenly attack your own cells or tissues instead of protecting you.

• Systemic Lupus Erythematosus:

This is when your immune system goes haywire, causing inflammation throughout your body. It can affect your skin, joints, kidneys, and the protective membranes around your organs. You might have flare-ups that come and go, often with fever.

• Acanthosis Nigricans:

You'll notice darker, thicker patches of skin, especially around your neck and in skin folds.

• Arthralgia or Arthritis:

Your joints become inflamed and painful.

• Autoimmunity:

Your immune system basically turns against you and attacks your own body.

• Fasting Hypoglycemia:

Your blood sugar drops too low when you haven't eaten.

• Weight loss:

You might lose weight without trying.

Type B Insulin Resistance Syndrome (TBIRS):

• Your diabetes shows up suddenly and becomes really hard to manage. Even massive doses of insulin won't seem to help much.
• You will notice your skin getting darker, especially on your face, underarms, and groin area.
• You might lose weight even though you are hungrier than usual.
• If you are a woman, you could experience high testosterone levels, which means irregular periods (or none at all) and extra hair growth in places you don't want it. In the beginning, you might have episodes of low blood sugar, though this is not common. Usually, low blood sugar happens later, once your insulin resistance starts to improve.

How Does Autoimmune Hypoglycemia Occur?

Two conditions where your body's immune system messes with your blood sugar control.

Insulin Autoimmune Syndrome (IAS):

It's actually the most common type of autoimmune hypoglycemia. Your body mistakenly creates antibodies (usually IgG) that attack your own insulin. These antibodies bind to insulin molecules, effectively holding them hostage, causing insulin levels to build up in your blood. These antibodies release all that stored insulin at random times, often after you have eaten, sending your blood sugar crashing down. Sometimes it happens when you are fasting too.

Type B Insulin Resistance Syndrome (TBIRS):

Your antibodies target the insulin receptors on your cells instead. When they bind to these receptors, they act like insulin itself, forcing your cells to suck up too much glucose from your blood. Low blood sugar strikes again.

How Is Autoimmune Hypoglycemia Diagnosed?

How doctors figure out if you have autoimmune hypoglycemia:

Insulin Autoimmune Syndrome:

• You will experience multiple episodes where your blood sugar drops on its own.
• Your body develops insulin autoantibodies even though you have never taken insulin shots.
• Your C-peptide levels shoot up noticeably.
• When tested, your insulin antibodies come back positive.
• Your insulin levels are through the roof, up to 100 mIU/L.

Type B Insulin Resistance Syndrome:

There is no single test that nails this diagnosis, but doctors suspect it when you have:

• Sky-high insulin levels even when you are fasting.
• Elevated adiponectin levels.
• Triglycerides are low or normal.
• Dark patches appear on your skin, especially if you already have an autoimmune condition.

How Is Autoimmune Hypoglycemia Treated?

The treatments for autoimmune hypoglycemia are as follows:

Insulin Autoimmune Syndrome:

• Eat small, frequent meals throughout the day and avoid simple sugars.
• You'll want to avoid medications that contain sulfhydryl groups, and if things get tough, your doctor might prescribe steroids to help out.
• If you are dealing with those reactive hypoglycemia episodes after meals, there's a medication called Acarbose that can help.
• For more serious cases, plasmapheresis might be your answer. This treatment filters your blood to reduce those troublesome antibodies, and it works even better when combined with corticosteroids. If you can't take steroids for some reason, plasmapheresis (a procedure that removes or replaces plasma) on its own can still do the trick.

Type B Insulin Resistance Syndrome:

With this condition, your treatment focuses on eliminating the antibodies that block your insulin. You will need to tackle any underlying autoimmune conditions like lupus to make real progress.

Managing diabetes with type B insulin resistance usually means you'll need insulin injections. Your body doesn't respond well to regular doses, so that you might need 10 to 20 times more insulin than typical diabetics. Your doctor might also suggest Metformin tablets to help your body respond better to insulin.

To tackle the root cause of your autoimmune issues, your treatment plan might include:

• Rituximab:

You'll get two IV (intravenous) treatments, spaced two weeks apart.

• Dexamethasone:

Dexamethasone will be prescribed for four days every month until you're in remission.

• Cyclophosphamide:

You'll take this pill daily until your symptoms clear up.

• Azathioprine:

Once you're in remission, you'll continue with one tablet daily for about six months to keep things stable.

Conclusion

If you are dealing with low blood sugar while on insulin, you cannot just tweak your dose. You need to take a careful approach to figure out what is going on. Getting the right diagnosis can help you avoid unnecessary belly exams and tests that waste your time. This condition, specifically insulin autoimmune syndrome, is usually harmless and tends to go away on its own. You will typically see it clear up within 3 to 6 months once you figure out what is triggering it and remove those triggers from your life.

While most cases resolve on their own, you might need to make some dietary changes. Your hormone specialist might suggest medications like Prednisone or Rituximab, which can help bring your glucose levels back to where they should be. These treatments have helped lots of people stabilize their blood sugar when nothing else seemed to work.

Key Takeaways

• If you are dealing with autoimmune hypoglycemia, you have a rare condition where your body's antibodies mess with your insulin or its receptors, causing severe blood sugar drops, especially after you eat.
• You might have triggered it with certain medications, or it could be linked to other autoimmune issues you have.
• You can usually manage it by eating smaller, low-carb meals throughout the day and stopping any medications that may cause problems.