Bartonella and Lyme Disease: Symptoms & Treatment
Bartonella in Lyme disease can contribute to neurologic, psychiatric, and pain symptoms that are often difficult to recognize.
Ticks can carry multiple pathogens. When Bartonella is present, patients may develop symptoms that do not fit a typical Lyme disease pattern.
For a broader overview, see our coinfections hub.
What Is Bartonella?
Bartonella is a bacterial infection transmitted by ticks, fleas, and potentially other vectors. Multiple Bartonella species can infect humans, with Bartonella henselae and Bartonella quintana being among the best known in human illness.
The bacteria invade endothelial cells lining blood vessels, causing vascular inflammation and a wide range of symptoms affecting the nervous system, skin, eyes, and other organs.
Unlike Lyme disease, which more often produces patterns such as migratory joint pain and erythema migrans rash, Bartonella symptoms are often neuropsychiatric and vascular—making them easier to miss when clinicians are not considering a co-infection.
There is ongoing debate in the medical community about whether Bartonella is consistently transmitted by ticks or more commonly associated with cat scratch disease. However, Bartonella species have been identified in ticks, and clinicians may consider it in patients with compatible symptom patterns.
Bartonella Symptoms in Lyme Disease Patients
Bartonella can produce a symptom profile that differs from Lyme disease alone. The most characteristic presentations include neuropsychiatric symptoms, burning pain, and vascular manifestations.
Neuropsychiatric symptoms
Patients may experience anxiety or panic attacks, rage episodes or emotional outbursts, intrusive thoughts, mood swings, depersonalization, and brain fog or cognitive dysfunction.
These symptoms often appear suddenly in previously stable individuals and may be misdiagnosed as primary psychiatric illness.
See also Bartonella psychiatric symptoms for case-based examples.
Burning pain
Patients describe burning sensations in the feet, especially the soles, as well as tingling or electric shock sensations, pain disproportionate to physical findings, worsening at night, and hypersensitivity to touch or pressure.
This pattern differs from typical Lyme neuropathy, which is often more numbing than burning.
Vascular and skin manifestations
Patients may develop stretch marks (striae) appearing without weight gain or pregnancy, red or purple skin streaks, subcutaneous nodules, papular rashes, or visible blood vessel changes.
The stretch marks associated with Bartonella often appear on the back, thighs, or abdomen in locations unusual for typical striae and may occur in males or non-pregnant females—clues that vascular inflammation rather than mechanical stretching may be contributing.
In clinical practice, similar striae are sometimes seen in patients with Lyme disease and other tick-borne conditions, suggesting these findings may reflect overlapping vascular effects rather than a single specific infection.
For a broader overview of symptom patterns, see our Lyme disease symptoms guide.
Other coinfections, such as Babesia, may also contribute to overlapping symptom patterns. For a broader overview, see our coinfections hub.
Why Bartonella Is Missed
Bartonella testing is unreliable. Serology has poor sensitivity, and PCR or culture methods often fail to detect chronic infection.
Interpreting Bartonella testing can also be complex. A positive result may reflect prior exposure, such as cat scratch disease, rather than active infection, while negative results do not reliably exclude disease because of the limited sensitivity of current testing methods.
As a result, patients with clear clinical symptoms may test negative, leading to missed or delayed diagnosis.
Because of these limitations, diagnosis often depends on recognizing symptom patterns rather than relying on a single test result.
In patients with multiple tick-borne infections, symptoms may reflect overlapping effects of Lyme disease, Bartonella, or other co-infections rather than a single identifiable cause.
For an example of misdiagnosis, see Bartonella and Lyme disease mimicking ALS and MS.
These challenges reflect broader issues discussed in Lyme testing limitations.
Bartonella and Psychiatric Misdiagnosis
The neuropsychiatric symptoms of Bartonella are frequently misdiagnosed as anxiety disorders, mood disorders, or other psychiatric conditions.
Patients may receive psychiatric treatment without recognition of an underlying infection, delaying appropriate care.
Treatment Challenges
Bartonella is difficult to treat because the bacteria reside inside cells and blood vessels, limiting antibiotic penetration.
Standard Lyme disease antibiotics may not adequately address Bartonella, often requiring different or combination therapies.
Much of the published research on Bartonella treatment comes from cat scratch disease. In patients with suspected tick-borne Bartonella, clinical presentation may differ, and treatment decisions are often guided by symptom patterns and response rather than standardized protocols alone.
Herxheimer reactions during Bartonella treatment can temporarily worsen symptoms, requiring careful clinical management.
Clinical Takeaways
Bartonella is a common Lyme disease coinfection that can produce neurologic, psychiatric, pain, and vascular symptoms distinct from Lyme disease alone.
Bartonella remains one of the more debated tick-borne infections. While some clinicians and patients emphasize Bartonella as the primary driver of symptoms, clinical patterns often suggest overlapping contributions from Lyme disease, Bartonella, and other co-infections.
Clinical recognition remains important when symptoms do not follow expected patterns or respond to standard treatment.
Frequently Asked Questions
What are the most common Bartonella symptoms?
Neuropsychiatric symptoms, burning foot pain, and vascular skin changes are among the most characteristic Bartonella patterns.
Can Bartonella cause psychiatric symptoms?
Yes. Anxiety, rage, mood changes, and cognitive symptoms are commonly described and may be misdiagnosed as primary psychiatric illness.
How is Bartonella diagnosed?
Diagnosis is often clinical because currently available laboratory testing has important limitations.
Does Bartonella respond to Lyme disease antibiotics?
Not always. Bartonella may require different antibiotic strategies than Lyme disease alone.
Can Bartonella occur without Lyme disease?
Yes, though coinfection can occur in patients with other tick-borne illnesses as well.
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
