Can Lyme Disease Be Misdiagnosed as Long COVID?
Lyme disease and Long COVID can look nearly identical.
Fatigue, brain fog, and POTS overlap.
But the timeline often reveals the difference.
Yes—Lyme disease can be misdiagnosed as Long COVID because both conditions share symptoms such as fatigue, brain fog, dizziness, and exercise intolerance.
The key difference is often when symptoms began and how they progressed over time.
A Case of Misdiagnosis
A woman was told her fatigue, brain fog, dizziness, and poor sleep were due to Long COVID. Some reassured her it would fade. Others said it was untreatable.
But she wasn’t improving.
When I evaluated her more closely, the pattern didn’t fit.
It wasn’t Long COVID. It was Lyme disease.
Why Lyme Disease and Long COVID Look Similar
- Brain fog
- Chronic fatigue
- POTS or lightheadedness
- Mood changes
- Migratory pain
- Exercise intolerance
- Poor sleep
This overlap is one of the main reasons misdiagnosis occurs.
The most important clue is timing—Lyme symptoms may begin before COVID or persist without improvement.
Key Differences Between Lyme Disease and Long COVID
- Lyme disease: symptoms may begin before COVID or without confirmed infection
- Long COVID: symptoms follow a known COVID illness
- Lyme disease: may include migrating pain and co-infections
- Long COVID: typically follows a post-viral pattern
The timeline of symptoms is often the most important clue.
The Risk of Mislabeling
Long COVID has helped validate persistent symptoms. But it has also become a broad label.
When clinicians assume all fatigue and brain fog are viral, they may stop asking key questions:
- Was Lyme disease fully evaluated?
- Were co-infections like Babesia or Bartonella considered?
- Were test results interpreted clinically?
This can delay diagnosis and treatment.
How I Evaluate These Patients
- Detailed history of outdoor exposure and prior illness
- Careful review of Lyme testing
- Screening for co-infections
- Treatment based on clinical findings—not just lab results
- Reevaluation when patients are not improving
For a deeper overview, see Long COVID and Lyme Disease.
Clinical Takeaway
Lyme disease and Long COVID can look nearly identical—but they are not the same condition.
When symptoms don’t improve or don’t follow a clear COVID timeline, Lyme disease should be considered.
The pattern over time often provides the most important clue.
Frequently Asked Questions
Can Lyme disease be mistaken for Long COVID?
Yes. Both conditions cause brain fog, fatigue, POTS, and exercise intolerance, making them easy to confuse without proper evaluation.
What’s the difference between Long COVID and Lyme disease?
Long COVID follows confirmed SARS-CoV-2 infection. Lyme disease is a tick-borne infection that may occur independently of COVID.
Should Long COVID patients be tested for Lyme disease?
Yes, especially if symptoms began without confirmed COVID or are not improving over time.
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
