Lyme: No link to multiple sclerosis, ALS, Alzheimer’s, autism, or Parkinson’s

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Despite false information online, Lyme disease is quite geographically restricted. The CDC reports “in 2015, 95% of confirmed Lyme disease cases were reported from 14 states.” This creates a natural experiment where it’s possible to see if Lyme incidence in areas of high Lyme disease incidence correlates to any other diseases.

Lyme disease has been blamed—with no compelling evidence—for autism, Alzheimer’s disease, Amyotrophic Lateral Sclerosis (ALS aka Motor Neuron Disease, MND, or Lou Gehrig’s Disease), Multiple Sclerosis (MS), Parkinson’s Disease, cancers, and suicides.

Chronic Lyme activists falsely state that Lyme disease either causes or commonly “mimics” just about everything.  But is any of this true? These are testable hypotheses.

Additionally, experts note that Lyme disease and other neurological disorders are easy to differentiate:

Patients with Lyme disease do not exhibit the white matter plaques seen on imaging of patients with multiple sclerosis, for example, and when patients with Lyme disease have oligoclonal bands in their cerebrospinal fluid, they are actually reactive against B burgdorferi. Lyme disease does not produce the upper motor neuron signs seen in amyotrophic lateral sclerosis.

ALS, MS, Parkinson’s disease, and Alzheimer’s disease: No link to Lyme disease

In 2018 and 2019, scientists reviewed 30 years of Danish medical records of patients diagnosed with Lyme neuroborreliosis. They found no connection between neuroborreliosis and any of ALS, MS, Parkinson’s disease, and Alzheimer’s disease.

In 2015, CDC scientists compared Lyme disease prevalence to death rates for ALS, MS, Parkinson’s disease, and Alzheimer’s disease, as illustrated in the figure below. Like in Denmark, the CDC scientists found no link between Lyme disease and any of ALS, MS, or Parkinson’s.

Experts recommend against testing

In 2020, the expert panel that wrote the consensus Lyme disease guidelines noted the lack of associations between Lyme disease and ALS, MS, Alzheimer’s, or Parkinson’s. The panel strongly recommended:

In patients with typical amyotrophic lateral sclerosis, relapsing-remitting multiple sclerosis, Parkinson’s disease, dementia or cognitive decline, or new-onset seizures, we recommend against routine testing for Lyme disease (strong recommendation, low-quality evidence).

The rationale for the panel’s recommendation included the following:

These recommendations place a high value on avoiding false positive Lyme disease test results, which can delay appropriate medical evaluation and treatment of other disorders and lead to unnecessary antibiotic exposure and potential side effects. Screening neurologic patients with a low a priori likelihood of Lyme disease—that is, without a history of tick bite, erythema migrans, or other more typical manifestations, would result in far more false positive than true positive results.


The CDC scientists mentioned above also found a small inverse correlation between Alzheimer’s disease deaths and Lyme disease. Where Lyme disease was high, Alzheimer’s disease death rates were lower. So does Lyme disease prevent Alzheimer’s? Probably not. But regardless, the CDC scientists were able to conclude:

Although associations between Lyme disease and Alzheimer disease, ALS, MS, and Parkinson disease have been proposed by writers of speculative websites and articles, supportive evidence for such an association is lacking. The absence of a positive correlation in the geographic distributions of these conditions provides further evidence against an association between Lyme disease and deaths from these 4 neurodegenerative conditions.

A 2014 study in the Journal of Alzheimer’s also found no positive correlation between Lyme disease and Alzheimer’s disease.

There is also no indication from studies of brain tissue of Alzheimer’s that Lyme-causing bacteria (Borrelia spirochetes) was present. In 2000, NIH researchers found no evidence of Borrelia DNA in samples from 15 patients. In 2017, scientists in Spain examined samples from 10 patients and found no evidence of Borrelia spirochetes via PCR or immunohistochemistry. In 1989, scientists found no evidence of Lyme disease bacteria in samples from six autopsy cases of Alzheimer’s, one case of Pick’s disease, one case of Creutzfeldt-Jakob disease, and four neurologically normal patients.

See also: Review by experts: Lack of Convincing Evidence that Borrelia burgdorferi Infection Causes Either Alzheimer’s Disease or Lewy Body Dementia

Multiple Sclerosis

The MS Society discussed two studies of antibodies in blood that did not indicate that Lyme disease is related to MS. (first study, second study)

MS is a degenerative disease. Delaying appropriate treatment can worsen a patient’s condition. Dr. David Patrick said “we hear of lost vision due to delayed diagnosis of multiple sclerosis because of a false-positive Lyme diagnosis.”

Dr. Steven Novella, Assistant Professor of Neurology at Yale School of Medicine and Executive Editor of Science-Based Medicine, deconstructs claims of Lyme disease causing MS. A Wired reporter recounted what happened when one of Dr. Novella’s patients could not accept a bleak diagnosis of ALS:

After the initial diagnosis, the man left the office, unable to cope with the fact that he had an incurable degenerative disease, likely to kill him within five years. He chose to visit a naturopath instead, who had redemptive news: conventional, narrow-minded medicine had misdiagnosed him. It wasn’t ALS, the naturopath said, but rather chronic Lyme disease, which could be treated with holistic, all-natural supplements.

Nearly a year later, badly degenerated, the man was back in Novella’s office. He’d wasted countless hours and thousands of dollars on false hope. Now, he was willing to listen, but with far less time to prepare for the reality of what lay ahead, and a spirit broken by disappointment.

Autism: No link to Lyme disease

In 2013, scientists analyzed serum samples of 120 children, including 70 with autism and 50 without autism. None of the 120 children tested positive for anti-bodies to Lyme using well established two-tier testing.

The scientists concluded:

The study’s sample size is large enough to effectively rule out the suggested high rates of Lyme disease or associated seroprevalence among affected children.

NIH scientists performed a similar study by looking at 183 children: 104 with autism, 24 with developmental delays, and 55 neurotypical controls.  All 183 children tested negative for Lyme antibodies and had no history of Lyme disease.

The NIH scientists concluded:

There was no evidence of an association between Lyme disease and autism.

Thankfully, the “Lyme-Induced Autism Foundation” is now defunct. Sadly, many of the doctors who spoke at “Lyme-Induced Autism” conferences are still practicing.

Why is there a Kentucky Lyme Disease Association when each year from 2006-2016 averaged about 8 confirmed Lyme cases? Because chronic Lyme is spread by word of mouth and the internet, not ticks.




Alzheimer’s disease

Multiple Sclerosis


Parkinson’s disease

Figure from CDC: Geographic distribution of Lyme disease compared with that for deaths due to amyotrophic lateral sclerosis (ALS), Parkinson disease, multiple sclerosis (MS), and Alzheimer disease. One dot represents 1 case (Lyme disease) or 1 death (ALS, Parkinson disease, MS, and Alzheimer disease) per 100,000 person-years; dots are placed randomly within the respective states.

Updated April 23, 2024