Is It Dementia, Parkinson’s… or Lyme Disease?

Lyme disease can mimic dementia, Parkinson’s disease, and seizures.
Neurologic symptoms may resemble primary neurodegenerative disease.
Fluctuating or multisystem illness should raise suspicion for Lyme disease.

Can Lyme disease mimic dementia, Parkinson’s disease, or seizures? Yes. Although uncommon, published case series have shown that Lyme neuroborreliosis can present with symptoms resembling dementia, Parkinson’s disease, and epilepsy. Memory loss, confusion, tremors, slowed movement, gait changes, and seizure-like episodes may all occur, making diagnosis challenging when infection is not initially suspected.

Patients may present with memory loss, movement abnormalities, tremors, confusion, or seizure-like episodes—symptoms that are frequently attributed to neurodegenerative or neurologic disease before an infectious cause is considered.

In some cases, the underlying problem is not a degenerative disorder but an infection affecting the nervous system. This diagnostic overlap is one reason Lyme disease is frequently missed or diagnosed late, particularly when symptoms do not follow the classic pattern of early Lyme disease.

These neurologic effects are often linked to immune activation and inflammation, as discussed in neuroinflammation in Lyme disease.

How Lyme Disease Can Mimic Neurologic Disorders

Lyme disease can affect both the central and peripheral nervous system—a condition known as neuroborreliosis.

When this occurs, symptoms may resemble primary neurologic conditions rather than an infection. Patients may develop:

• Memory loss or cognitive decline
• Slowed thinking or confusion
• Tremors or movement abnormalities
• Gait instability
• Seizure-like episodes

These symptoms often overlap with brain fog in Lyme disease, where inflammation affects memory, attention, and processing speed.

Because these neurologic manifestations are nonspecific, they can closely resemble dementia, Parkinson’s disease, epilepsy, or other neurologic disorders—leading to misdiagnosis and delayed treatment.

Examples of Lyme Disease Mimicking Other Conditions

Clinical studies have documented cases in which Lyme disease presented as dementia-like cognitive decline, Parkinson-like movement disorders, and epileptic seizures or altered consciousness.

In one study, patients with neuroborreliosis developed symptoms ranging from memory impairment and personality changes to tremor, gait abnormalities, and seizure activity—often without the classic early signs of Lyme disease.

Unlike primary neurodegenerative diseases, some of these neurologic symptoms may improve when the underlying infection is recognized and treated.

This distinction is clinically important and may be overlooked. For a documented case of Lyme disease initially attributed to dementia, see Lyme disease mistaken for dementia: when confusion is reversible.

For a broader understanding of how Lyme encephalopathy presents, see Lyme encephalopathy symptoms and complications.

For a comprehensive review of the overlap between Lyme disease and dementia—including clinical cases, research findings, and diagnostic considerations—see Lyme Disease and Dementia: When Cognitive Decline Has Another Cause.

Why Lyme Disease Is Mistaken for Other Diagnoses

Lyme disease is often called the “great imitator” because its symptoms overlap with many neurologic and systemic illnesses.

Several factors contribute to misdiagnosis:

• Symptoms develop gradually or fluctuate rather than following a predictable course.
• Early manifestations may be mild or overlooked.
• Lyme disease testing may be negative early in the illness.
• Symptoms often involve multiple body systems rather than a single organ.

When symptoms are evaluated in isolation, they may be attributed to more common neurologic conditions instead of an underlying infection.

These challenges parallel broader limitations discussed in Lyme disease misdiagnosis.

Clues That Suggest Lyme Disease Instead

Although overlap exists, several clinical features may suggest Lyme disease rather than a primary neurodegenerative disorder:

• Fluctuating symptoms rather than steady progression
• A combination of neurologic symptoms, fatigue, and musculoskeletal pain
• A history of tick exposure—even if no tick bite is recalled
• Additional findings such as facial palsy, radicular pain, or peripheral neuropathy

These patterns may not be obvious early but often become clearer as the illness evolves.

Learn more in Delayed Lyme disease diagnosis.

Why Diagnosis Requires a Broader View

Lyme disease does not always follow a predictable course. Symptoms may shift, fluctuate, and involve multiple organ systems over time.

When neurologic symptoms do not fit neatly into a single diagnosis, it may be helpful to consider whether multiple systems are involved and whether an infectious cause has been adequately evaluated.

This broader clinical perspective is explored in the Lyme disease symptoms guide.

Frequently Asked Questions

Can Lyme disease cause symptoms that look like Parkinson’s disease?

Yes. Lyme neuroborreliosis can cause tremors, slowed movement, stiffness, reduced facial expression (masked facies), bradykinesia, and gait instability that resemble Parkinson’s disease. In some reported cases, these symptoms improved after appropriate antibiotic treatment, helping distinguish them from primary neurodegenerative Parkinson’s disease.

Can Lyme disease cause dementia-like symptoms?

Yes. Memory loss, confusion, slowed thinking, and cognitive impairment caused by Lyme encephalopathy can resemble dementia. Unlike primary dementia, infection-related cognitive symptoms may improve when Lyme disease is recognized and appropriately treated.

Can Lyme disease cause confusion?

Yes. Lyme disease may cause confusion, difficulty concentrating, slowed thinking, and short-term memory problems, particularly when the central nervous system is involved. Because these symptoms can fluctuate, they may be mistaken for dementia or another neurologic disorder before Lyme disease is considered.

Can Lyme disease cause seizures?

In some cases, yes. Neuroborreliosis has been associated with seizure-like episodes and altered consciousness, particularly when inflammation involves the central nervous system.

How can clinicians tell the difference between Lyme disease and a primary neurologic disorder?

Clues that favor Lyme disease include fluctuating rather than steadily progressive symptoms, involvement of multiple body systems, possible tick exposure, facial palsy or radicular pain, and lack of a typical course for primary neurodegenerative disease. Lyme serology, cerebrospinal fluid analysis when appropriate, and the overall clinical picture may help establish the diagnosis.

Clinical Takeaway

Lyme disease can mimic dementia, Parkinson’s disease, seizures, and other neurologic conditions through its effects on the central and peripheral nervous system. Unlike primary neurodegenerative disorders, some of these neurologic presentations may improve when the underlying infection is recognized and appropriately treated.

When neurologic symptoms are atypical, fluctuate over time, or involve multiple body systems—particularly in patients with possible tick exposure—Lyme disease should remain in the differential diagnosis before a degenerative neurologic disorder is assumed.

Related Articles

Neuroinflammation in Lyme Disease
Delayed Lyme Disease Diagnosis
Lyme Disease Symptoms Guide
Brain Fog in Lyme Disease
Persistent Lyme Disease Overview
Lyme Meningitis and Parkinsonism: A Reversible Cause

References

1. Hudasch D, Konen FF, Möhn N, et al. Neuroborreliosis with encephalitis: a broad spectrum of clinical manifestations. BMC Infect Dis. 2025.

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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