For years, patients with chronic Lyme disease have heard the same thing.
Their lab work looks normal. Their treatment is finished. They shouldn’t still be sick.
Yet many continue to struggle with crushing fatigue, joint pain, memory problems, anxiety, insomnia, and dozens of other symptoms that can make everyday life difficult.
According to Dr. Richard Horowitz, one of the world’s leading Lyme disease experts and author of Ending Chronic Illness, this is exactly where medicine often gets it wrong.
Appearing on “A Healthy Point of View” podcast with Sam Tejada, CEO and Founder of Liquivida®, the internationally recognized Lyme disease specialist shared lessons from more than 40 years of practice, explaining why he believes doctors must stop looking for a single cause and start asking a much bigger question: what is keeping the patient sick?
A Doctor Who Never Stopped Looking
Early in the conversation, Dr. Horowitz reflected on the physicians who shaped him.
He spoke fondly about several pioneers in Lyme medicine, including Dr. Joseph Burrascano, Dr. Kenneth Liegner, and Dr. Sam Donta. When Horowitz attended his first Lyme conference in the early 1990s, he was still trying to understand how to help patients who weren’t recovering. Listening to these physicians changed his thinking and pushed him to look beyond standard approaches.
But one mentor stood out.
While attending medical school, Horowitz worked with a physician named Dr. Rhodesenek. The doctor, he recalled, had an extraordinary ability to solve difficult cases. After hospital rounds had ended, Horowitz would return to continue discussing patients and reviewing complicated medical histories.
Those sessions left a lasting impression.
“He was like a medical detective,” Horowitz told Sam.
That detective mindset would eventually define his entire career.
The Shift From Conventional Medicine to Functional Medicine
Horowitz began his career as a board-certified internist, practicing medicine the way he had been trained.
But something bothered him.
Patients were being diagnosed, given medications, and sent home, yet many remained chronically ill. Naming diseases and prescribing drugs was not producing the outcomes he expected to see.
Searching for answers, Horowitz started reading the work of environmental medicine pioneer Dr. Sherry Rogers. He attended conferences hosted by organizations such as A4M and IFM and gradually became immersed in functional medicine.
The experience transformed the way he viewed disease.
Instead of focusing only on diagnoses, he started looking for root causes.
The Patient in the Wheelchair Who Changed Everything
One of the stories Horowitz shared involved a woman in her thirties who arrived at his office in a wheelchair.
She had been unable to walk for five years.
The woman was also experiencing severe drenching sweats, but despite seeing multiple physicians and receiving antibiotics, she was not improving.
Horowitz suspected Babesia, a malaria-like parasite transmitted by ticks.
At the time, Babesia was not believed to exist in New York’s Hudson Valley. Nevertheless, he sent her blood for testing and also submitted local ticks for analysis.
The results confirmed his suspicion.
The patient was treated with atovaquone and azithromycin. Within weeks, she began standing again. Eventually, she regained the ability to walk.
Today, Horowitz says, she is skiing. For him, the case was a turning point.
It demonstrated that Lyme disease often involves much more than Lyme itself.
When the Real Problem Isn’t Lyme Alone
As the years passed, Horowitz continued encountering unusual cases.
He described another patient who had developed aphasia and had lost the ability to speak. Prestigious hospitals had considered stroke and atypical migraine as possible explanations.
Horowitz eventually discovered that the patient had Bartonella, another tick-borne infection.
After receiving appropriate treatment, the patient’s speech returned.
Experiences like these led Horowitz to a conclusion that would shape decades of research: patients frequently suffer from multiple overlapping illnesses at the same time.
He began identifying not only Borrelia, the bacteria responsible for Lyme disease, but also Bartonella, Babesia, viral reactivations, fungal overgrowth, mold exposure, heavy metal toxicity, hormonal abnormalities, and significant disturbances in the gut microbiome.
Over time, these observations evolved into what he now calls MSIDS, Multiple Systemic Infectious Disease Syndrome.
Sixteen Different Factors May Be Driving Chronic Illness
Horowitz explained to Sam that his MSIDS model contains sixteen separate areas that physicians should evaluate when caring for chronically ill patients.
The concept developed gradually, one patient at a time.
As he reviewed scientific literature, he noticed that the same underlying factors repeatedly appeared across a wide range of illnesses, not only Lyme disease, but also chronic fatigue syndrome, fibromyalgia, autoimmune disorders, mood disorders, cardiovascular disease, Alzheimer’s disease, ADHD, autism, allergies, and even cancer.
Again and again, he found recurring themes: persistent infections, toxins, immune dysfunction, inflammation, gut problems, hormonal imbalances, and nutritional deficiencies.
According to Horowitz, treating only one problem while ignoring the others is often why patients fail to recover.
Lyme Disease Doesn’t Always Look Like Lyme Disease
Another important point discussed during the interview was symptom variability.
Many people assume Lyme disease always produces a rash.
Horowitz disagrees.
Some patients, he explained, may present with nothing more than a swollen joint. Others complain primarily of fatigue or memory difficulties. Many simply believe they are “getting older.”
Symptoms can include chronic fatigue, muscle pain, brain fog, depression, anxiety, insomnia, chest pain, heart palpitations, shortness of breath, and cognitive decline.
Babesia, specifically, can produce drenching day sweats, night sweats, shaking chills, flushing, and a sensation known as air hunger, where patients struggle to catch their breath.
Because the presentation varies so widely, Horowitz developed a Lyme questionnaire that has been validated in more than 1,600 individuals. He encouraged listeners who suspect Lyme disease to complete the questionnaire and discuss the results with their healthcare providers.
Could Chronic Infections Play a Role in Alzheimer’s Disease?
Perhaps the most provocative section of the discussion centered on dementia.
Horowitz noted that both syphilis and Lyme disease belong to a group of bacteria known as spirochetes. Since syphilis has long been associated with dementia, researchers have questioned whether Lyme disease may contribute to neurodegenerative illness in certain individuals.
He discussed recently published work involving a patient whose Alzheimer’s biomarker, p-tau217, reportedly normalized after undergoing his treatment protocol.
While Horowitz acknowledged that much more research is needed, he believes infections deserve far greater attention in conversations surrounding cognitive decline.
With Alzheimer’s cases continuing to rise worldwide, he argues that medicine should remain open to investigating every possible contributor.
A Message of Hope
Near the end of the conversation, Sam asked Horowitz what message he would like to leave listeners.
His answer was simple. Don’t give up.
After treating more than 13,000 chronically ill patients, Horowitz said he has repeatedly watched people recover after years of suffering and after consulting ten, twenty, or even thirty physicians.
Help, he believes, is available.
For patients who have spent years searching for answers, that message may be the most important lesson of all.