Bartonella Psychiatric Symptoms: Anxiety, Mood Changes, and Misdiagnosis
Bartonella psychiatric symptoms can look like primary mental illness before anyone considers infection. Sudden panic attacks, rage, agitation, depression, or personality change may be treated as psychiatric disease alone—especially when the connection to tick bites, flea exposure, rashes, or swollen lymph nodes is missed.
That is one reason Bartonella is often overlooked in patients with complex tick-borne illness. For a broader clinical overview, start with Bartonella and Lyme disease.
In their 2007 article, “Do Bartonella Infections Cause Agitation, Panic Disorder, and Treatment-Resistant Depression?” Schaller and colleagues describe three patients with acute psychiatric symptoms associated with Bartonella-like signs and symptoms.
Each patient had exposure to ticks, fleas, or cats and developed findings consistent with Bartonella infection, including unilateral lymph node enlargement, linear rashes, and bacillary angiomatosis.
The authors concluded that these patients developed clear new psychiatric morbidity—including agitation, panic attacks, and treatment-resistant depression—that could plausibly be attributed to Bartonella infection.
In these cases, psychotropic medications alone were not enough. Once antibiotic treatment was started for presumed Bartonella, symptoms improved substantially and patients moved closer to their prior baseline.
This pattern fits a broader problem seen across Lyme disease coinfections: infection-driven symptoms may be mislabeled when the full clinical picture is not recognized.
Case 1: Rage and Agitation After Tick Bites
A 41-year-old man developed what his family described as a complete personality change after a camping trip in North Carolina.
He first noticed a small painful right axillary lymph node and fever after removing three deer ticks from his leg and shoulder.
Five weeks later, he developed irritability, severe insomnia, rage, and sensitivity to smells and sounds. He also continued to report persistent right-sided axillary lymph node enlargement.
Lyme disease testing was negative. Still, clinicians suspected Bartonella based on the unilateral lymph node finding and tick exposure.
A PCR test for two Bartonella species was initially negative but later positive for B. henselae when repeated.
Over the next two weeks, he developed marked agitation, panic attacks, and major depression. During arguments with his spouse, he threw objects into the walls of the home.
He was diagnosed with bipolar disorder despite no previous history of depression or mania. Psychotropic medications did not relieve his symptoms.
An infectious disease clinician prescribed azithromycin and rifampin for suspected Bartonella infection. After eight weeks of treatment, the patient’s lymph node complaints resolved and his psychiatric symptoms were reduced substantially.
According to his spouse and closest friend, his personality returned to approximately 90% of baseline.
Case 2: Panic Attacks After Cat and Flea Exposure
A medical student developed a rash on her thighs consisting of four linear lines after adopting two young cats from a shelter. She also reported several flea bites.
Around the same time, she developed new panic attacks, profound restlessness, and depression.
Treatment with psychotropic medications was not effective.
Her nurse practitioner suspected Bartonella and prescribed cefuroxime and azithromycin. During the first week of treatment, she became more sad, irritable, and hopeless, with worsening panic attacks.
By week two, symptoms had eased slightly. By week three, the rash had disappeared. By week eight, both depression and anxiety had improved substantially.
Six months later, some symptoms returned, including inappropriate anger, heightened interpersonal sensitivity, severe premenstrual dysphoric disorder, irritability, and sadness. She was retreated with rifampicin and cefdinir and improved again.
Antibiotics Reduced the Need for Psychotropics
All patients initially required higher doses of psychotropic medications in order to function.
After antibiotic treatment, doses were reduced or discontinued as Bartonella psychiatric symptoms improved.
These reports do not prove that every psychiatric symptom is caused by Bartonella. But they do show why infection should be considered when symptoms begin abruptly, follow tick, flea, or cat exposure, and do not respond as expected to psychiatric treatment alone.
That same diagnostic problem is often seen in neuropsychiatric Lyme disease, where infection can resemble anxiety, depression, cognitive dysfunction, or another primary psychiatric disorder.
Clinical Takeaway
Sudden personality change, rage, panic, agitation, or treatment-resistant depression after tick, flea, or cat exposure should not be dismissed too quickly as primary psychiatric disease.
When psychiatric symptoms appear alongside swollen lymph nodes, rash, fatigue, or other multisystem complaints, Bartonella may deserve consideration as part of the differential. This is especially important in patients already being evaluated for Lyme disease symptoms or related coinfections.
In these cases, psychotropic medications alone were not enough. Clinical improvement followed treatment directed at the underlying infection.
Frequently Asked Questions
Can Bartonella cause psychiatric symptoms?
Yes. Bartonella psychiatric symptoms can include agitation, panic attacks, rage, treatment-resistant depression, and sudden personality changes.
How is Bartonella transmitted?
Bartonella can be transmitted through tick bites, flea bites, cat scratches, and other animal exposures.
Do psychiatric medications help Bartonella symptoms?
In these cases, psychotropic medications alone were not effective. Patients improved after receiving antibiotic treatment targeting Bartonella.
What antibiotics are used for Bartonella?
Treatment combinations included azithromycin with rifampin and cefuroxime with azithromycin. Treatment duration was typically eight weeks or longer.
Can Bartonella testing be negative even when infection is present?
Yes. In one case, PCR testing was initially negative for Bartonella but positive on repeat. A single negative test does not rule out infection.
Related Reading
- Bartonella and Lyme Disease
- Lyme Disease Co-Infections: What Patients Need to Know
- Neuropsychiatric Lyme: Infection, Not Mental Illness
- Lyme Disease Symptoms Guide
References
- Schaller JL, Burkland GA, Langhoff PJ. Do Bartonella infections cause agitation, panic disorder, and treatment-resistant depression? MedGenMed. 2007;9(3):54.
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
Dr Cameron, I’m under the care of an LLMD in my area (Central New Jersey) for Lyme and Bartonella. I was on doxy and Clarithromycin for 4 1/2 months after catching the symptoms early (I’ve had Lyme several times before). I stopped taking the antibiotics after I got a terrible intestinal Candida infection that I couldn’t get rid of while on the antibiotics. After almost three weeks on Diflucan, I feel better. Is 4 1/2 months of antibiotics generally long enough to treat Bartonella? I’m reading between 4 and 6 months and I’m in that range. I ask because my LLMD – there aren’t a lot available in my area – feels that I should keep taking the antibiotics but the problems the problems they’re now causing are just as bad as the original infection.
I have had patients who have benefited from treatment for other tick borne infections ie Lyme with Ceftin or Babesia with Malarone, I sometimes have used lower doses or single therapy. Finally, I have had to refer to rule out other issues.
Hi Dr. Cameron! I just wanted to ask a question If that’s OK. My teenage daughter was diagnosed with Bartonella. She has always had some level of psychiatric issues, including OCD, and then after the tick bite things got so much worse for her mental health. She’s been on antibiotics for three months and the lines on the back of her knees have lightened up dramatically, with only just a little bit of red at the top of one of the stria. Her Mental health actually seems to be getting much worse as treatment goes on. I don’t think this is normal and I was wondering if there were any other cases like this that you have seen. Thank you!
I have other cases. In some cases, they have another co-infection like Babesia that is leading to the psychiatric problems.
We need help! My daughter has had Lyme disease and two of its co-infections since she was 13, 1994! When I took her in to the doctor, I said, “I think she has a tick related illness”. She had swelling around her eyes! 6 years later she was diagnosed! She has been treated periodically since that time! She was going along the last few years, okay. A little more energy, and actually enjoying life a bit! Then wham! Horrible anxiety, panic attacks, depression, anxiety! She’s been in two rehab facilities, with suicidal ideation! It has been a nightmare! Her Lyme doc immediately said her Bart was acting up! He started her on way too heavy of a protocol, and that was worse. Herring, and mental problems! Do you have any ideas? We are at the end of our rope, and don’t want to lose our daughter!
I face the same challenges. I have found lower doses helpful including a pediatric dose treatment for Babesia. I have also found it helpful to include some counseling during my visits. All the best on your journey.
Are there any hospital or care centers that treat Bartonella and mental illness at the same time.
I am not aware of a hospital. There are doctor who are experienced in evaluating for a tick borne infection