Can Lyme Disease Affect the Brain? Neurologic Symptoms Explained

Lyme disease can affect the brain and nervous system.
Neurologic symptoms may occur before arthritis develops.
Early recognition and treatment may improve outcomes.

Can Lyme disease affect the brain? Yes. Lyme disease can involve the central and peripheral nervous systems, leading to neurologic symptoms such as facial nerve palsy, meningitis, painful nerve inflammation, cognitive symptoms, headaches, and balance problems. A review by Govil and colleagues highlights the neurologic features of Lyme disease that clinicians—including rheumatologists—should recognize.¹

In their article entitled Common Neurologic Features of Lyme Disease That May Present to a Rheumatologist, Govil et al. describe the various ways Lyme disease can affect the brain and nervous system. The authors emphasize that rheumatologists should recognize the most common neurologic presentations because many patients initially present with joint pain rather than classic early Lyme disease findings.¹

It is particularly important, the authors write, for rheumatologists to take a thorough history in patients with joint pain and not rely on the presence of an erythema migrans (EM) rash.

As Govil explains, “because skin lesions related to Lyme disease occur at the onset of the disease, and the main symptoms of arthralgias occur later, it is not likely that the rheumatologist would see them when the patient first presents.” Instead, neurologic symptoms may already be present.

When Lyme disease affects the nervous system, it can produce neurologic symptoms such as facial nerve palsy, the most common presentation according to Govil and colleagues.

The authors cited a Canadian study involving 475 patients with Lyme disease.² Only 35 patients (7.4%) developed true arthritis, while 440 (92.6%) experienced arthralgias.²

Neurologic manifestations were even more common, occurring in 259 (54.5%) patients. “Thus, common extracutaneous manifestations are now found to be neurologic,” Govil writes.¹

Can Lyme disease affect the brain?

Neurologic Lyme disease may involve the brain, meninges, cranial nerves, spinal nerve roots, or peripheral nerves. Symptoms vary depending on the structures involved and the stage of infection. Some patients develop obvious neurologic deficits such as facial weakness, while others experience more subtle problems including cognitive slowing, memory complaints, headaches, or imbalance.

The most common neurologic features of early disseminated Lyme disease include:

• cranial nerve VII palsy (rarely other cranial nerves are involved)
• aseptic meningitis syndrome
• acute painful radiculoneuritis

Infrequent neurologic manifestations include:

• cerebrovascular complications, including vasculitis
• encephalomyelitis
• intracranial hypertension syndromes (particularly in adolescents)

Early disseminated Lyme disease may also present with a lymphocytic (mononuclear) meningitis that is clinically indistinguishable from viral meningitis, as well as acute painful radiculoneuritis.

Can Lyme disease cause brain lesions?

Some patients with Lyme neuroborreliosis have MRI abnormalities, including white matter lesions. However, these findings are not specific for Lyme disease and may resemble those seen in multiple sclerosis, small vessel disease, migraine, or other neurologic disorders. Many patients with neurologic Lyme disease have a normal brain MRI. Imaging findings should always be interpreted together with the patient’s history, neurologic examination, laboratory testing, and overall clinical picture.

For additional clinical examples, see How does Lyme disease affect the brain? (6 cases).

The most common neurologic manifestations of late-stage Lyme disease include subtle encephalopathy and peripheral neuropathies.

“A mild chronic encephalopathy may be the most common neurologic manifestation in patients with late-stage Lyme disease.”

The symptoms tend to be diffuse and nonspecific. Patients commonly report memory problems, difficulty concentrating, slowed thinking, sleep disturbance, fatigue, depression, and what many describe as “brain fog.”

Whether these neurologic symptoms result from persistent infection, residual inflammation, immune mechanisms, or other factors remains uncertain, according to the authors.¹ Ongoing research continues to investigate the underlying mechanisms.

Rheumatologists are in an excellent position, Govil writes, to identify patients who may have been missed during the earliest stage of Lyme disease but later develop rheumatologic and neurologic symptoms.

“Preparedness can maximize favorable outcomes for these patients.”

“It can be difficult to diagnose a patient with neurologic Lyme disease. Therefore, it is important for a rheumatologist to initially gather a carefully elicited history from the patient.”

Authors conclude:

“When examining a patient with possible endemic area exposure to B. burgdorferi with rheumatologic complaints, it is important to consider Lyme disease and particularly neurologic Lyme disease as a possible diagnosis.”

When suspecting Lyme disease, keep in mind:

• Arthralgias are more common than arthritis.
• Neurologic manifestations are more common than arthritis in many reported series.
• Skin lesions often do not have the classic bull’s-eye appearance.
• Neurologic involvement may occur early in disseminated Lyme disease.
• Early recognition and timely treatment remain important.

Frequently Asked Questions

Can Lyme disease affect the brain?

Yes. Lyme disease can affect both the central and peripheral nervous systems. Neurologic Lyme disease may present with facial nerve palsy, meningitis, painful radiculoneuritis, cognitive symptoms, headaches, balance problems, and peripheral neuropathy. The specific symptoms depend on the stage of infection and the structures involved.

What are the neurological symptoms of Lyme disease?

Common neurologic symptoms include facial weakness (Bell’s palsy), severe headaches, neck stiffness, nerve pain, numbness or tingling, memory problems, difficulty concentrating, slowed thinking, sleep disturbances, fatigue, and balance problems. Less common complications include encephalomyelitis, cerebrovascular involvement, and intracranial hypertension.

Can Lyme disease cause brain lesions?

Brain MRI abnormalities have been reported in some patients with Lyme neuroborreliosis, but they are not specific to Lyme disease. White matter lesions may resemble those seen in multiple sclerosis, migraine, or small vessel disease, while many patients with neurologic Lyme disease have a normal MRI. Imaging results should always be interpreted in the context of the patient’s history, examination, and laboratory findings.

Can neurologic Lyme disease be treated?

Most patients improve with appropriate antibiotic therapy, particularly when Lyme disease is recognized early. Recovery varies depending on the severity of neurologic involvement, the duration of symptoms before treatment, and individual patient factors. Some patients may experience persistent symptoms that require continued medical follow-up.

Clinical Takeaway

Neurologic Lyme disease is more common than many clinicians appreciate and may present before classic Lyme arthritis develops. A careful history, recognition of neurologic symptoms, and consideration of Lyme disease in patients with compatible exposure remain essential for timely diagnosis.

Recognizing neurologic Lyme disease early may improve the opportunity for prompt treatment and better clinical outcomes.

Related Articles

Neuroinflammation in Lyme Disease and Brain Fog
Lyme Disease Symptoms Guide
Why Early Lyme Disease Tests Can Be Negative

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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