Can Lyme Disease Cause Dementia-Like Symptoms? Kris Kristofferson’s Story
Lyme disease may cause dementia-like cognitive symptoms
Rare neuroborreliosis cases can resemble dementia
Some patients improve after diagnosis and treatment
Can Lyme disease cause dementia-like symptoms? In rare cases, Lyme neuroborreliosis may cause memory loss, confusion, slowed thinking, word-finding problems, and behavioral changes that resemble dementia.
These presentations are uncommon, and cognitive decline has many possible causes. However, the distinction matters because some Lyme-related cognitive symptoms may improve when the underlying infection or associated neurologic illness is identified and treated.
The reported experience of country music legend Kris Kristofferson brought widespread attention to this issue. Published medical reports also describe patients whose apparent dementia was ultimately linked to Lyme neuroborreliosis.
What Are Dementia-Like Symptoms in Lyme Disease?
Lyme disease can affect cognition in several ways. Patients may describe:
- Short-term memory loss
- Brain fog
- Difficulty concentrating
- Word-finding problems
- Slowed processing speed
- Confusion or disorientation
- Mood or personality changes
- Difficulty completing familiar tasks
- Reduced mental stamina
These symptoms can resemble mild cognitive impairment, Alzheimer’s disease, Lewy body dementia, vascular dementia, depression, medication side effects, or other neurologic conditions.
The phrase dementia-like is important. Cognitive symptoms associated with Lyme disease do not necessarily mean that a patient has a progressive neurodegenerative dementia.
Kris Kristofferson’s Lyme Disease Story
Country music legend Kris Kristofferson developed increasingly severe memory loss that doctors reportedly attributed to either Alzheimer’s disease or dementia related to head injuries from boxing, football, and rugby earlier in his life.
According to Rolling Stone, his memory problems became so severe that he sometimes could not remember what he was doing from one moment to the next.
According to published media reports, testing for Lyme disease later came back positive. After he stopped taking medication prescribed for Alzheimer’s disease and depression and began treatment for Lyme disease, his wife, Lisa, reported a striking improvement in his memory and mood.
Kristofferson’s experience does not establish that every case of memory loss should be attributed to Lyme disease. It does demonstrate why clinicians should consider reversible and treatable conditions when cognitive symptoms do not follow a typical pattern.
Read more: CBS News: Kris Kristofferson’s Lyme disease was mistaken for Alzheimer’s.
An 81-Year-Old Man Diagnosed With Dementia
The Washington Post reported on an 81-year-old retired Defense Intelligence Agency case officer who had previously survived leukemia. He later developed rapidly progressive cognitive and neurologic symptoms and was told that he had dementia.
Doctors reportedly feared that he had a rapidly progressive and potentially fatal form of dementia, possibly an aggressive form of Alzheimer’s disease.
The man became moody, confused, delusional, and at times childlike. He also developed tremors, difficulty walking, and urinary incontinence.
He was eventually diagnosed with Lyme meningoencephalitis. After antibiotic treatment, he reportedly made a full recovery.
This case illustrates an important clinical lesson: a rapid change in cognition accompanied by gait problems, tremor, incontinence, or other neurologic findings should prompt an evaluation for potentially reversible causes.
A Woman With Dementia-Like Symptoms and Normal Pressure Hydrocephalus
Topakian and colleagues described a 75-year-old woman in Austria who developed a 10-month decline in cognition. Her symptoms included low mood, disorientation, impaired attention, poor concentration, and short-term memory loss.
Her examination showed slowed speech and movement, word-finding problems, rigidity, bradykinesia, and an unsteady, broad-based gait. Her Mini-Mental State Examination score was 20 out of 30.
Brain imaging showed mild white matter changes and enlargement of the lateral ventricles, raising concern for early normal pressure hydrocephalus. Other possible explanations included medication effects, depression, anxiety, chronic pain, and a previous head injury.
Cerebrospinal fluid testing showed lymphocytic inflammation, elevated protein, oligoclonal bands, and intrathecal production of antibodies against Borrelia burgdorferi. The authors diagnosed late Lyme neuroborreliosis.
After three weeks of intravenous ceftriaxone, the woman improved substantially. Three weeks after completing treatment, her Mini-Mental State Examination score increased from 20 to 28, and the reported neurologic findings resolved. She remained well at 15-month follow-up.
A 75-Year-Old Man Admitted to an Alzheimer’s Care Unit
Sanchini and colleagues reported another case involving a 75-year-old man who was admitted to an Alzheimer’s disease care unit with confusion, hallucinations, aggressive behavior, insomnia, wandering, and urinary incontinence.
Before his rapid deterioration, he had remained largely independent and had experienced only mild memory difficulties. He also developed migrating joint pain and skin findings that led his doctors to investigate infectious causes.
Blood testing for Lyme disease was positive and confirmed by immunoblot. The patient and his family declined cerebrospinal fluid testing, limiting the authors’ ability to establish definite Lyme neuroborreliosis.
After antibiotic treatment, his hallucinations, delusions, insomnia, orientation, behavior, mobility, and continence improved. His Mini-Mental State Examination score increased from 22 to 29 out of 30, although some memory and executive difficulties remained.
The authors ultimately described the presentation as delirium associated with Lyme disease rather than confirmed dementia due to neuroborreliosis. The case emphasizes the importance of distinguishing acute or rapidly progressive delirium from irreversible dementia.
What Does the Research Show About Lyme Disease and Dementia?
Descriptions of dementia caused by Lyme neuroborreliosis are rare. The strongest available evidence consists primarily of case reports, case series, and observational studies rather than large clinical trials.
Blanc and colleagues prospectively evaluated 1,594 patients referred for dementia. Twenty patients had a positive intrathecal antibody index indicating antibody production against Borrelia within the central nervous system.
Seven patients were classified as having neuroborreliosis and experienced stability or mild improvement following antibiotic treatment. The other 13 continued to decline despite antibiotics and were ultimately diagnosed with conditions such as Alzheimer’s disease, Lewy body disease, frontotemporal dementia, hippocampal sclerosis, or vascular dementia.
This study highlights an important limitation of testing: evidence of exposure to Borrelia, or even intrathecal antibody production, does not automatically prove that Lyme disease is responsible for a patient’s cognitive decline. A neurodegenerative disorder may coexist with positive Lyme findings.
Kristoferitsch and colleagues also reviewed carefully documented cases of dementia-like syndromes associated with definite Lyme neuroborreliosis. They concluded that these presentations are rare and may differ from primary dementia by progressing more rapidly and occurring with early gait disturbance, urinary problems, weight loss, tremor, headache, or other signs of nervous system inflammation.
The patients described in that review generally improved after two to four weeks of antibiotic treatment. The authors reported no indication for prolonged antibiotic therapy in those cases.
Can Lyme Disease Cause Memory Loss?
Yes. Memory loss, difficulty concentrating, impaired word retrieval, and slowed thinking have been described in patients with neurologic Lyme disease and in patients with persistent symptoms following treatment.
Some patients describe a fluctuating mental fog rather than a steady loss of stored memories. They may know what they want to say but cannot retrieve the word quickly, follow a complex conversation, or manage several tasks at once.
A 2025 systematic review and meta-analysis identified memory impairment, concentration difficulties, word-finding problems, emotional symptoms, and other neurologic complaints across the Lyme disease literature. However, the included studies were highly variable, and the authors identified substantial heterogeneity and possible publication bias.
These broader cognitive symptoms should not be confused with the much rarer syndrome of definite Lyme neuroborreliosis presenting primarily as dementia.
How Can Lyme Disease Be Distinguished From Alzheimer’s Disease?
No single symptom reliably separates Lyme-related cognitive impairment from Alzheimer’s disease. Nevertheless, several findings may justify a broader diagnostic evaluation:
- Rapid or unusually sudden cognitive decline
- Marked fluctuation from one day to another
- Early gait disturbance or repeated falls
- Urinary dysfunction occurring with cognitive changes
- Headache, neck discomfort, tremor, neuropathy, or cranial nerve symptoms
- Coexisting fatigue, joint pain, migrating pain, or other systemic symptoms
- Possible tick exposure or residence in a Lyme-endemic area
- A previous expanding rash, facial palsy, or unexplained neurologic illness
- Symptoms that do not follow the expected course of a neurodegenerative disorder
Alzheimer’s disease generally causes progressive impairment in memory, learning, orientation, and independent function. Lyme-related cognitive symptoms may be more variable and may occur alongside pain, fatigue, sleep disruption, autonomic symptoms, or other neurologic findings.
There can be considerable overlap. Patients should not attempt to distinguish these conditions without a complete medical evaluation.
Does a Positive Lyme Test Prove Lyme Is Causing Dementia?
No. A positive blood test may reflect previous exposure rather than active nervous system infection. Lyme test results must be interpreted alongside the patient’s history, examination, symptom pattern, and other diagnostic findings.
As demonstrated in the study by Blanc and colleagues, some patients with positive intrathecal Lyme antibody findings ultimately had progressive neurodegenerative disorders rather than cognitive decline that responded to antibiotic treatment.
A careful evaluation should therefore consider Lyme disease without prematurely excluding Alzheimer’s disease, Lewy body disease, vascular disease, medication effects, metabolic disorders, sleep apnea, depression, vitamin deficiencies, thyroid disease, autoimmune illness, normal pressure hydrocephalus, and other infections.
Is a Spinal Tap Always Necessary?
Cerebrospinal fluid analysis can be important when meningitis, encephalitis, radiculitis, or definite Lyme neuroborreliosis is suspected. Testing may include the white blood cell count, protein level, oligoclonal bands, and comparison of Lyme antibodies in the blood and spinal fluid.
However, spinal fluid findings depend on the type of neurologic presentation. In the classic study by Logigian and colleagues, only 2 of 27 patients with chronic neurologic Lyme disease had the specific cerebrospinal fluid abnormalities described by the investigators.
A normal spinal tap therefore does not necessarily exclude every neurologic manifestation associated with Lyme disease. At the same time, definite central nervous system Lyme neuroborreliosis usually requires stronger evidence than cognitive symptoms and a positive blood test alone.
The decision to perform a lumbar puncture should be individualized according to the clinical presentation.
Not Every Patient Recovers Completely
The dramatic recoveries described in individual reports should not imply that every patient with Lyme-related cognitive symptoms will recover quickly or completely.
Fallon and colleagues studied patients with persistent Lyme encephalopathy whose cognitive symptoms remained present years after their original treatment. Weitzner and colleagues also reported long-term symptoms in a subset of patients evaluated 11 to 20 years after early Lyme disease.
Persistent symptoms may include fatigue, pain, sleep disturbance, memory problems, and reduced cognitive stamina. These presentations may fall within the broader discussion of post-treatment Lyme disease syndrome, but they are not the same as definite active neuroborreliosis presenting as dementia.
Recovery varies according to the underlying diagnosis, timing of treatment, severity and duration of illness, coexisting medical conditions, and the presence of a separate neurodegenerative disease.
Why a Careful Evaluation Matters
I have spent much of my career evaluating cognitive symptoms. Before specializing in Lyme disease, I taught medical students about dementia and directed programs assessing memory loss in older adults.
In my practice, I have seen how brain fog, fatigue, memory loss, word-finding problems, mood changes, pain, and sleep disruption can overlap with many medical conditions. That experience has reinforced the importance of avoiding premature conclusions.
Lyme disease should not be assumed to explain every case of cognitive decline. It also should not be dismissed when the history and clinical pattern raise reasonable concern.
A broad evaluation offers the best opportunity to identify both reversible illnesses and progressive neurologic disorders.
Frequently Asked Questions
Can Lyme disease cause dementia-like symptoms?
In rare cases, Lyme neuroborreliosis may cause memory loss, confusion, brain fog, word-finding problems, slowed thinking, and behavioral changes that resemble dementia.
Can Lyme disease cause memory loss?
Yes. Some patients with Lyme disease report short-term memory problems, poor concentration, difficulty retrieving words, slowed processing, and reduced mental stamina.
Can Lyme disease be mistaken for Alzheimer’s disease?
Yes. Lyme-related cognitive symptoms may be mistaken for Alzheimer’s disease when memory loss and confusion are attributed to aging or neurodegeneration. However, Alzheimer’s disease and other dementias remain much more common causes of progressive cognitive decline.
Was Kris Kristofferson diagnosed with Lyme disease?
Yes. Published media reports stated that Kris Kristofferson tested positive for Lyme disease after his memory problems had previously been attributed to Alzheimer’s disease or head trauma. His family reported improvement after Lyme disease treatment.
Can Lyme-related cognitive decline be reversed?
Some patients described in published case reports improved substantially after treatment for Lyme neuroborreliosis. Recovery is not guaranteed and depends on the correct diagnosis, duration of illness, treatment timing, and whether another neurologic condition is also present.
Does a positive Lyme test prove Lyme disease is causing dementia?
No. A positive test may indicate previous exposure and does not by itself establish that Lyme disease is causing cognitive decline. Results must be interpreted in the context of the patient’s symptoms, examination, and other diagnostic findings.
Clinical Takeaway
Lyme disease can occasionally cause cognitive symptoms that resemble dementia, including memory loss, confusion, word-finding difficulty, and slowed thinking.
The cases involving Kris Kristofferson, the retired intelligence officer, and patients described in the medical literature illustrate why rapidly progressive or atypical cognitive decline deserves a broad evaluation.
These reports should not be interpreted to mean that most dementia is caused by Lyme disease. Alzheimer’s disease and other neurodegenerative disorders remain important and common diagnoses, and positive Lyme testing alone does not establish causation.
Considering reversible causes while continuing to evaluate for neurodegenerative disease can prevent both missed infections and incorrect attribution of cognitive decline to Lyme disease.
Related Articles
These articles explore related causes of brain fog, cognitive dysfunction, neurologic symptoms, and delayed diagnosis.
Brain Fog in Lyme Disease
Lyme Encephalopathy Symptoms and Complications
Lyme Disease Misdiagnosis
Persistent Lyme Disease Overview
Lyme Disease Symptoms Guide
References
- Strauss N. Kris Kristofferson: An Outlaw at 80. Rolling Stone. 2016.
- Boodman SG. He beat leukemia. But then, mysteriously, things got really bad. The Washington Post. 2016.
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- Logigian EL, Kaplan RF, Steere AC. Chronic neurologic manifestations of Lyme disease. N Engl J Med. 1990;323(21):1438-1444.
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- Weitzner E, Visintainer P, Wormser GP. Comparison of males versus females with culture-confirmed early Lyme disease at presentation and at 11-20 years after diagnosis. Diagn Microbiol Infect Dis. 2016;85(4):493-495.
- Blanc F, Philippi N, Cretin B, et al. Lyme neuroborreliosis and dementia. J Alzheimers Dis. 2014;41(4):1087-1093.
- Kristoferitsch W, Aboulenein-Djamshidian F, Jecel J, et al. Secondary dementia due to Lyme neuroborreliosis. Wien Klin Wochenschr. 2018;130(15-16):468-478.
- Sanchini C, Papia C, Cutaia C, Poloni TE, Cesari M. A case of reversible dementia? Dementia vs delirium in Lyme disease. Ann Geriatr Med Res. 2023;27(1):80-82.
- Bashchobanov DH, Stamatova E, Andonova R, et al. Lyme neuroborreliosis in the context of dementia syndromes. Cureus. 2024;16(8):e67057.
- Bushi G, Balaraman AK, Gaidhane S, et al. Lyme disease associated neurological and musculoskeletal symptoms: A systematic review and meta-analysis. Brain Behav Immun Health. 2025;43:100931.
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
