Undiagnosed Lyme Disease: When Symptoms Are Missed or Never Considered

Undiagnosed Lyme disease often begins with omission.
Symptoms may be fragmented across multiple specialties.
Tick-borne illness is sometimes never considered.

Undiagnosed Lyme disease often begins quietly—when key diagnoses are never considered.

This pattern—undiagnosed Lyme disease due to incomplete evaluation—is one I see repeatedly in clinical practice.

Just weeks ago, I evaluated a patient who specifically requested a consultation for Lyme disease. Before the visit, I reviewed her chart expecting to see at least some evaluation for tick-borne illness.

She had already seen rheumatology, neurology, and infectious disease.

Her records documented:

• fatigue
• cognitive slowing
• joint pain
• palpitations
• headaches
• air hunger

But one thing stood out immediately.

There had been no Lyme disease evaluation.

No Western blot. No co-infection testing. No documentation that tick-borne illness had even been considered.

She lived in a high-risk region. She spent time outdoors. Her symptoms followed a recognizable Lyme disease symptom pattern. Yet Lyme disease was not on the differential.

This is how undiagnosed Lyme disease often begins—not with overt denial, but with omission.

I discuss this broader pattern further in Medical Dismissal in Chronic Lyme Disease.

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When Lyme Disease Is Never Considered

Her decline began nearly a year earlier after a summer hike.

She did not recall a tick bite. She never noticed a rash.

She developed a flu-like illness followed by symptoms that never resolved.

Over time, her condition worsened.

She was treated for anxiety. Prescribed medications for sleep and inflammation. Evaluated for lupus and multiple sclerosis.

Each specialist ruled something out—but no one integrated the full clinical picture.

This pattern reflects a broader issue in complex illness care: once a syndromic diagnosis is applied, etiologic inquiry often stops.

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Diagnoses That Describe Patterns—Not Causes

Patients with multisystem symptoms are often labeled with:

• fibromyalgia
• POTS
• ME/CFS
• mast cell activation syndrome
• hypermobility syndromes
• hormonal imbalance
• dysbiosis
• long COVID
• stress-related explanations

Each diagnosis has a legitimate clinical basis. The concern is not their existence—but their use in isolation.

Many of these syndromes follow infection. Yet once a label is applied, the infectious trigger may no longer be revisited.

This is how undiagnosed Lyme disease becomes entrenched.

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Recognizing Undiagnosed Lyme Disease

We returned to first principles.

I mapped exposure history, symptom evolution, and cross-system coherence.

Based on the full picture, I ordered:

• Lyme IgM and IgG Western blot
• Babesia and Bartonella testing
• repeat inflammatory markers

Lyme disease remains a clinical diagnosis—guided by exposure risk, symptom trajectory, and pattern recognition—not algorithms alone.

This is particularly important when early Lyme disease tests are negative.

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The Results—and a Turning Point

Her Lyme IgG Western blot was positive with six of ten bands.

She also tested positive for Babesia duncani IgG.

This was not Lyme disease alone. It was Lyme disease with co-infection.

This explained why her prior brief doxycycline course had failed. Babesia does not respond to doxycycline.

Treatment was adjusted accordingly. For the first time in months, there was a coherent plan.

Air hunger, night sweats, and treatment-resistant symptoms frequently point toward Babesia.

I review this further in Babesia Air Hunger: When Breathing Feels Manual.

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Why Lyme Disease Goes Undiagnosed

Undiagnosed Lyme disease rarely reflects a single mistake.

It reflects diagnostic closure over time.

Patients accumulate fragmented evaluations. Symptoms are managed piecemeal. Testing is incomplete. Responsibility for synthesis falls through the cracks.

Premature closure is rarely intentional. It often arises from:

• time pressure
• guideline anchoring
• fragmented specialty care
• discomfort with uncertainty

This pattern is common in Lyme disease misdiagnosis, where symptoms are attributed to more familiar conditions without revisiting the underlying cause.

Public health agencies acknowledge that symptoms may persist after treatment, including guidance from the CDC. :contentReference[oaicite:0]{index=0}

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Preventing Undiagnosed Lyme Disease

Preventing undiagnosed Lyme disease requires diagnostic curiosity.

It requires revisiting assumptions. Reassessing exposure. Re-evaluating incomplete testing.

Diagnoses should guide inquiry—not replace it.

This patient did not need reassurance that tests were normal.

She needed someone to ask what had not yet been tested.

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Frequently Asked Questions

How common is undiagnosed Lyme disease?

Undiagnosed Lyme disease is common, particularly when symptoms are nonspecific and no tick bite or rash is recalled.

What is Lyme disease commonly mistaken for?

Lyme disease is frequently mistaken for fibromyalgia, chronic fatigue syndrome, anxiety, depression, multiple sclerosis, lupus, POTS, or autoimmune disease.

Why does Lyme disease go undiagnosed?

Lyme disease may go undiagnosed because symptoms are multisystem, testing has limitations, and clinicians may anchor on more familiar syndromic labels.

What should I do if I suspect undiagnosed Lyme disease?

Consult a clinician experienced in tick-borne illness who can review exposure history, symptom progression, and testing comprehensively.

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Clinical Perspective

Undiagnosed Lyme disease often reflects a failure to integrate multisystem symptoms into a coherent clinical pattern.

When fatigue, cognitive dysfunction, autonomic symptoms, pain, and fluctuating neurologic complaints occur together—particularly after outdoor exposure—tick-borne illness should remain on the differential diagnosis.

Complex illness requires reassessment, pattern recognition, and diagnostic humility.

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Dr. Daniel Cameron, MD, MPH
Lyme disease clinician with over 30 years of experience and past president of ILADS.

Symptoms • Testing • Coinfections • Recovery • Pediatric • Prevention