Long COVID and Lyme Disease: Why Symptoms Overlap

Long COVID and Lyme disease can look strikingly similar: fatigue, brain fog, pain, dysautonomia, and symptoms that persist long after the original infection.

Long COVID and Lyme disease share more than a list of symptoms. Both can leave patients with persistent, multi-system illness that is difficult to measure on standard tests and too often dismissed.

For patients with a history of Lyme disease who later develop symptoms after COVID-19, the overlap can be confusing. Is this Long COVID? A Lyme relapse? A post-infectious syndrome? Or more than one process at the same time?

That uncertainty is exactly why this connection deserves attention.

What My Research Found About Long COVID and Lyme Disease

In 2023, I published a peer-reviewed study in the journal Antibiotics examining individuals with a history of Lyme disease who contracted COVID-19 or received the COVID-19 vaccine. The study included 889 participants.

The findings raised an important clinical question: could a history of Lyme disease increase the risk of persistent symptoms after COVID-19?

One in five Lyme patients who contracted COVID-19 reported Long COVID. This suggests that Lyme disease history may be one factor that increases vulnerability to prolonged post-infectious illness.

Neurological symptoms were especially important. Patients with both Lyme disease history and Long COVID reported worse neurological symptoms than those who had COVID-19 but did not develop Long COVID.

The symptom burden was also high across multiple domains, including fatigue, pain, neurological symptoms, and neuropsychiatric complaints.

Read the full study in Antibiotics →

Why Long COVID and Lyme Disease Can Look Alike

Both Long COVID and Lyme disease can affect multiple systems at once. Patients may not present with one isolated symptom. Instead, they often describe a shifting pattern of fatigue, pain, cognitive problems, sleep disruption, dizziness, and neurological complaints.

Shared Symptom Patterns in Long COVID and Lyme Disease

Common overlapping symptom domains include:

Fatigue and post-exertional worsening
Pain, muscle aches, or joint symptoms
Brain fog, memory problems, and slowed processing
Neurological symptoms such as tingling, burning, buzzing, or sensitivity
Autonomic symptoms such as dizziness, palpitations, lightheadedness, or exercise intolerance
Viral-like flares that come and go

For more on cognitive symptoms, see brain fog in Lyme disease.

Dysautonomia May Be a Common Thread

One reason Long COVID and Lyme disease may feel similar is that both can involve the autonomic nervous system — the system that helps regulate heart rate, blood pressure, temperature, digestion, sweating, and exercise tolerance.

When this system is disrupted, patients may feel lightheaded, shaky, weak, internally restless, or unable to tolerate normal activity.

Learn more about autonomic dysfunction and Lyme disease.

Post-Infectious Illness: A Useful Framework

Long COVID has forced medicine to recognize something Lyme disease patients have described for years: infections can trigger persistent illness even after the acute phase has passed.

Post-Treatment Lyme Disease Syndrome and Long COVID are both often discussed as post-infectious syndromes. In both, patients may continue to experience symptoms long after the original infection should have resolved.

For a broader clinical overview, see persistent Lyme disease symptoms.

Why Standard Testing May Not Explain Everything

One of the most frustrating experiences for patients with Long COVID and Lyme disease is being told that testing is normal while symptoms remain disabling.

Standard tests may help rule out certain conditions, but they do not always explain fatigue, brain fog, dysautonomia, neuropathic symptoms, or post-exertional crashes.

This does not mean the symptoms are imaginary. It means the clinical picture may be more complex than a single routine test can capture.

For related information, see Lyme disease test accuracy.

Clinical Perspective

When a patient has a history of Lyme disease and later develops persistent symptoms after COVID-19, I do not assume there is only one explanation.

The pattern matters. Timing matters. Prior infections matter. Coinfections, immune activation, autonomic dysfunction, sleep disruption, inflammation, and other medical conditions may all need to be considered.

The goal is not to force every symptom into one label. The goal is to understand the full clinical picture.

Related Lyme Disease Resources

Final Takeaway

Long COVID and Lyme disease can overlap in ways that are clinically important. Both may involve fatigue, brain fog, dysautonomia, neurological symptoms, and a pattern of illness that standard testing does not always explain.

For patients, the key message is simple: persistent symptoms deserve careful evaluation — not dismissal.

Contact Dr. Cameron’s office →

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