Unexplained Headaches: Could the Cause Be IgG4-Related Disease?

Could Your Unexplained Headache Be Something More? 

Headaches alone aren’t enough for a diagnosis, but when they show up with other unexplained symptoms, they may offer a clue. If your chronic unexplained headaches don’t improve with standard treatment — or you also notice gland swelling, sinus pain, or neurological symptoms — it’s worth wondering whether an inflammatory or autoimmune condition could be involved.

Unexplained headaches are recurring head pain without a confirmed medical cause, especially when imaging or standard treatments don’t reveal why they’re happening. Some people experience these headaches as part of an inflammatory or autoimmune condition like IgG4-related disease, particularly when other symptoms appear at the same time.

Red flags to watch for: 

• Headaches that don’t respond to medication. 
• Swollen glands around the eyes, jaw, or neck. 
• Bulging or painful eyes. 
• Visual changes or facial numbness. 
• Fatigue, weight loss, or other unexplained symptoms. 
• Sinus symptoms that don’t resolve with antibiotics. 

Unexplained Headaches That Don’t Respond to Treatment

For example, Kristi, 54, from Ohio, has lived with chronic headaches for years — at least 20 days each month. Her pain often resists treatment and becomes disabling, yet doctors still haven’t identified the cause. She has undergone tests, tried countless medications, and even explored therapies like Reiki, but the headaches continue. In addition, her MRI shows scattered white lesions, and yet doctors have not looked much further than her family history of migraines.

However, puzzling headaches are not a common symptom of IgG4-related disease (IgG4-RD), yet they can happen. In certain situations, doctors see these headaches when IgG4-RD affects the coverings of the brain and spinal cord (called hypertrophic pachymeningitis) or the tissues around the eyes and sinuses. As a result, inflammation and pressure can lead to headaches. 

Even so, doctors sometimes overlook a rare condition known as IgG4-related disease (IgG4-RD) as the diagnosis. IgG4-RD can cause swelling or lumps in the salivary or tear glands, persistent nasal congestion, unexplained swelling in other areas, abdominal pain, jaundice, or changes in kidney function. Therefore, if you have headaches that aren’t improving and notice any of these other symptoms, it may be time to talk to your doctor about whether IgG4-RD could be a possibility. 

What Is IgG4-Related Disease? 

IgG4-RD is a rare autoimmune disease that causes chronic inflammation and scarring (fibrosis) in different organs throughout the body. It’s driven by an immune system that mistakenly attacks the body’s own tissues — and it can affect almost any organ, including the head and neck. 

Because symptoms of IgG4-RD often mimic more common conditions, doctors sometimes misdiagnose it or miss it altogether. When IgG4-RD involves the central nervous system or surrounding areas, it may cause: 

• Persistent headaches 
• Eye pain or swelling 
• Facial numbness 
• Neurological symptoms like vision or hearing changes 
• Chronic sinus problems 

These symptoms may resemble migraines, tension-type headaches, or sinus infections, which is why understanding the link between IgG4-RD and chronic headaches is essential. 

Learn more: Symptoms of IgG4-RD

How Can IgG4-RD Cause Headaches? 

While not everyone with IgG4-RD experiences headaches, the disease can impact areas that lead to persistent or severe headaches, such as: 

• The meninges: These protective brain layers can thicken and become inflamed (hypertrophic pachymeningitis), resulting in ongoing, sometimes debilitating headaches. 
• The pituitary gland: Inflammation here (hypophysitis) might cause headaches, hormonal problems, and other symptoms. 
• Head and neck arteries: IgG4-RD can inflame blood vessel walls, potentially causing pain or headaches, especially if blood flow is compromised. 
• Face and head nerves: The disease may inflame the trigeminal nerve, which is crucial for facial sensation and can be associated with nerve-related facial and head pain. 

When IgG4-RD affects the head and neck region, it can lead to a range of symptoms, including unexplained headaches that don’t respond to standard treatments.

How IgG4-RD Relates to Unexplained Headaches

Hypertrophic Pachymeningitis

This condition involves inflammation and thickening of the meninges, the outer covering of the brain. It can lead to pressure-like headaches and may also affect vision or hearing. Hypertrophic Pachymeningitis is one of the most serious inflammatory causes of headaches linked to IgG4-RD.

Orbital Inflammation

When IgG4-RD affects the eye sockets, it can lead to pain around the eyes or forehead, often mistaken for sinus headaches or eye strain.

Pituitary Gland Involvement (Hypophysitis)

When the pituitary gland at the base of the brain becomes inflamed, it can trigger deep, central headaches along with fatigue or hormonal issues.

Doctors may not recognize these headache forms early, especially when patients have been diagnosed with migraine or other primary headache disorders.

Why IgG4-RD Is Misdiagnosed 

Because IgG4-related disease is rare, many doctors may not consider it when evaluating headaches with no known cause. Diagnosis typically requires:

• MRI or CT scans to detect inflammation

• Blood tests that include IgG4 levels

• A biopsy to confirm the presence of IgG4-positive cells

• Surveying symptoms from head to toe

What is IgG4 in blood tests? Learn more. 

Mahsa’s Journey: Linking Chronic Headaches to IgG4-Related Disease 

Patient stories can help reveal symptom patterns that testing alone sometimes misses. Mahsa Pazokifard knows this reality well.

Unexplained headaches and migraines have been a lifelong challenge for Mahsa Pazokifard, but they worsened after flares from IgG4-related dacryoadenitis and sialadenitis (Mikulicz’s disease). She describes waking up with her eyes “puffed shut” due to swelling in the glands around her eyes (called lacrimal glands), which caused blurred vision, light sensitivity, and migraine with aura.

In fact, she noticed a connection between her headaches and involvement of her head and neck due to IgG4-RD, particularly when glands in that area were inflamed or when she experienced facial pain due to trigeminal neuralgia (a nerve condition caused by IgG4-RD). 

The Moment Things Changed for Mahsa

To be clear, Mahsa is not just a patient describing pain. She is a patient whose diagnostic path was eventually validated by rheumatologists and ophthalmology specialists experienced in inflammatory causes of unexplained headaches. For this reason, her story has become an important patient-expert example of why ongoing investigation matters.

She tried multiple treatments, including:

• Botox,
• Magnesium,
• B12 supplements,
• Facet joint injections,
• Rituximab infusions, and
• Steroids.

And yet, she found the greatest relief from rituximab infusions combined with steroids. Additionally, Mahsa shares that hydration IVs with vitamins and glutathione have been helpful in reducing her headache pain from 10 to 3 on a 0-10 pain scale. 

Importantly, Mahsa emphasizes that even with treatment, flares can still trigger severe headaches and that many doctors underestimate their connection to IgG4-RD. For this reason, she now advises patients diagnosed with IgG4-RD who experience persistent headaches to seek care from neuro-ophthalmologists or immuno-ophthalmologists. 

Getting a Diagnosis 

Getting a diagnosis is a key step in what can be a complex process.

Your doctor may order tests, including:  

• Blood tests, including levels of IgG4 antibodies (though high levels alone aren’t enough) 
• MRI or CT scans to look for swelling or inflammation in the brain, sinuses, or other tissues 
• Doctors sometimes perform a biopsy (tissue sample) to confirm inflammation patterns typical of the disease. 

So, if you are taking medication like steroids, it’s important to talk with your doctor about a tapering schedule before having certain diagnostic tests.  

Chronic Headaches: Real Patient Experiences

The following stories highlight the experiences of individuals living with chronic headaches that are often unexplained and difficult to diagnose and treat. Although these individuals have not been diagnosed with IgG4-related disease, their experiences reflect the real challenges faced by many who suffer from ongoing symptoms without clear answers.

Together, their stories aim to shed light on the complexities of hard-to-treat conditions and emphasize the importance of ongoing investigation and awareness.

Kristi’s Story: Living with Intractable Pain 

Kristi Estep, 54, from Ohio, describes her unexplained headaches as “all-encompassing and debilitating.” Despite undergoing imaging, lab work, and numerous treatments, she hasn’t found lasting relief.  “I just wish I knew when it would stop — and that insurance wasn’t such a barrier,” she says. While doctors have focused on her family history of migraines, the lesions on her MRI have never been explored further — leaving her without closure and a definitive diagnosis.  

“I know I can’t predict when the headaches will stop, but I shouldn’t have to fight so hard to get the help I need,” says Kristi.

Living with Unexplained Headaches: Nancy’s Search for Answers

Nancy Bonk, from New York, has had tension-type headaches for years, about three times weekly, feeling like a tight band around her head. Despite CT scans, X-rays, and MRIs, doctors still haven’t identified a cause.

“No doctor has given me a reason,” says Nancy. “Education and knowledge are so important.” 

Donna’s Story: Decades of Migraine 

Doctors diagnosed Donna Kobayashi, 53, with migraine at age six, and she now experiences chronic migraine about 16 days each month. On top of that, she has 1-2 severe attacks weekly, lasting 12-72 hours, with intense throbbing pain, nausea, and a tough recovery. 

Despite this, she manages her daily life with migraine symptoms—ranging from light sensitivity to episodes of debilitating fatigue. By speaking up and forming connections with others, she has rediscovered her strength and sense of hope.  

Read more: Patient stories of misdiagnosis 

Questions to Ask Your Doctor About IgG4-RD 

If you’re living with refractory migraine, headaches with no known cause, or unusual neurological symptoms, these questions may help guide your next steps: 

• Could inflammation, including IgG4-related disease, be causing these symptoms? 
• Have my IgG4 antibody levels been checked? 
• Are there signs of inflammation of the meninges (meh-NIN-jeez) or hypertrophic pachymeningitis (high-per-TROH-fik pack-ee-meh-nin-GUY-tis) on my imaging? 
• Should I see a rheumatologist or neurologist familiar with IgG4-RD? 
• Might a biopsy give us clearer answers or help rule out other conditions? 
• Would immunosuppressive treatment help relieve my symptoms? 

Ultimately, you know your body best — trust yourself and keep asking questions if something doesn’t feel right.

Explore more: How to get a second opinion 

There Is Hope 

Your lived experience matters. Trust your symptoms, your instincts, and your story — they are powerful tools in the diagnostic process.  

“You’re an expert — no one knows your body like you do,” advises Mahsa.  

Whether your headaches are caused by IgG4-RD or something else, you deserve to be heard — and to find a care team that takes your symptoms seriously. 

Quick FAQ: Could My Headaches Be Misdiagnosed? 

Q: What is IgG4-RD?
IgG4-related disease (IgG4-RD) is a rare autoimmune condition that causes inflammation and scarring in different parts of the body, including the meninges, sinuses, and salivary glands. 

Q: Can IgG4-RD cause headaches?
Yes. Especially when it causes hypertrophic pachymeningitis, orbital inflammation, or pituitary involvement. 

Q: What tests can diagnose it?
MRI, CT scans, IgG4 blood levels, and tissue biopsy are often needed. There is no single test or biomarker that can definitively confirm IgG4-RD, but information from all these tests helps build a fuller picture that points to the diagnosis 

Q: If I have unexplained headaches and swollen glands or eye pain, does it mean I need to be evaluated for IgG4-RD?

Not necessarily — IgG4-RD does not cause most headache cases. Many other conditions can cause symptoms such as headaches, swollen glands, or eye pain. However, if these symptoms persist and don’t respond to typical treatments or resurface without a clear explanation, it’s worth talking to your doctor about them further.

Q: Where might IgG4-RD affect the body?

IgG4-RD causes inflammation in different parts of the body, including the head and neck. In some people, it can affect the tissues around the eyes, certain nerves, the meninges (the protective layers around the brain), or glands in the face and neck — and that can lead to headaches, swelling, or eye problems. 

Q: What’s the treatment?
Immunosuppressants, including corticosteroids and B-cell targeted therapies  

Q: Who can help?
A neurologist, rheumatologist, or immunologist familiar with rare causes of headache 

Learn More About IgG4-RD

Click here to learn more about the process of getting diagnosed.

This article was made possible with support from Amgen.