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Undiagnosed Lyme disease often begins quietly—when key diagnoses are never considered.
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, and air hunger.
But one thing stood out immediately.
There was 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 post-infectious 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 in Medical Dismissal in Chronic Lyme Disease.
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.
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, or 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.
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.
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.
Why Undiagnosed Lyme Disease Keeps Happening
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 arises from time pressure, guideline anchoring, and discomfort with uncertainty.
Public health agencies acknowledge that symptoms may persist after treatment, including guidance from the CDC.
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.
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?
It is often mistaken for fibromyalgia, chronic fatigue syndrome, anxiety, depression, multiple sclerosis, lupus, POTS, or autoimmune disease.
Why does Lyme disease go undiagnosed?
It goes undiagnosed because symptoms are multisystem and testing has limitations. Diagnostic momentum often favors 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.
References
- CDC (2024). Post-treatment Lyme disease syndrome.
- Feder HM, et al. Clin Infect Dis. 2006.
- Rebman AW, et al. BMJ Open. 2020.
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
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