Depersonalization, Derealization, and Intrusive Thoughts in Lyme Disease
Depersonalization, derealization, and anxiety can occur in some patients with Lyme disease.
These symptoms may reflect neurologic and autonomic dysfunction rather than loss of reality.
Recognition and treatment of the underlying illness may lead to improvement.
Depersonalization, derealization, anxiety, and intrusive thoughts are among the neuropsychiatric symptoms reported in some patients with Lyme disease. These symptoms can make a person feel disconnected from themselves or the world around them. If you are experiencing these symptoms, you are not imagining them—and you are not losing control.
Some patients with Lyme disease describe a deeply unsettling change in how they experience their thoughts, emotions, or surroundings. They may say, “I don’t feel like myself,” “Everything feels unreal,” or “I feel disconnected from my body.” Others describe intrusive thoughts that seem foreign or out of character. These symptoms can be frightening, particularly when they develop abruptly in someone with no previous psychiatric history.
In my clinical practice, depersonalization, derealization, anxiety, and cognitive dysfunction are among the more common neuropsychiatric symptoms reported by patients with neurologic Lyme disease. For many patients, these symptoms appear alongside other neurologic Lyme disease manifestations and often worsen during flares or periods of physiologic stress.
Why These Symptoms Feel So Disturbing
These experiences challenge a person’s sense of identity and safety. Patients often tell me, “I don’t feel like myself,” or “My mind doesn’t feel normal anymore.” The distress comes not only from the symptoms themselves but also from the fear that they signify a serious psychiatric illness.
Importantly, most patients retain insight. They recognize that something has changed and understand that their thoughts or perceptions are abnormal. This distinction helps differentiate these experiences from many primary psychotic disorders, although careful medical and psychiatric evaluation remains essential.
What Are Intrusive Thoughts?
Intrusive thoughts are unwanted, repetitive thoughts, images, or impulses that feel foreign to the person experiencing them. They are distressing because they do not reflect the person’s intentions, values, or personality.
Many patients do not use the term “intrusive thoughts.” Instead, they describe their minds as feeling “stuck,” “different,” or “not under my usual control.” Others simply report that disturbing thoughts seem to appear without warning and are difficult to dismiss.
Although the exact mechanism remains uncertain, these symptoms may reflect altered brain network function related to immune activation, neuroinflammation, autonomic dysfunction, or altered neurotransmitter signaling rather than a primary psychiatric disorder alone.
Depersonalization and Derealization Are Perceptual Changes—Not Loss of Reality
Depersonalization refers to feeling detached from oneself—emotionally numb, unreal, or disconnected from one’s body.
Derealization refers to feeling as though the external world is distant, dreamlike, artificial, or visually altered.
Importantly, patients generally retain insight. They recognize these experiences as abnormal even though they feel intensely real. These symptoms are not synonymous with psychosis.
In Lyme disease, depersonalization and derealization may fluctuate, often worsening with fatigue, illness, poor sleep, autonomic symptoms, or physiologic stress before improving as neurologic stability returns.
How Lyme Disease May Contribute to These Symptoms
Lyme disease can affect the central nervous system through immune activation, inflammatory signaling, and altered neurotransmitter signaling. These processes may disrupt limbic and cortical networks involved in emotional regulation, threat detection, attention, and sensory integration.
When these networks become dysregulated, the brain may remain in a heightened state of alert even when no danger is present. Emotional processing, perception, and attention may become altered, contributing to anxiety, intrusive thoughts, depersonalization, and derealization.
Neuropsychiatric manifestations of Lyme disease include anxiety, depression, cognitive dysfunction, obsessive symptoms, intrusive thoughts, depersonalization, and derealization. These symptoms have been described in reviews, observational studies, and clinical series and are increasingly recognized as part of the spectrum of neurologic involvement in some patients. Hallucinations and psychosis have also been reported but appear to be much less common manifestations.1-6
The Autonomic Nervous System’s Role
The autonomic nervous system regulates arousal, safety, and internal balance. Autonomic dysfunction is common in Lyme disease and may contribute to persistent fight-or-flight activation.
Persistent sympathetic activation, poor sleep, orthostatic intolerance, dizziness, sensory hypersensitivity, and chronic physiologic stress may amplify anxiety, depersonalization, and derealization, even when structural brain imaging is normal.
When the nervous system remains hyperaroused, the brain may temporarily distance itself from emotional and sensory input. Depersonalization and derealization may therefore represent biologic responses to sustained autonomic stress rather than evidence of losing touch with reality.
Can Lyme Disease Cause Hallucinations or Psychosis?
Hallucinations and psychosis have been reported in patients with Lyme disease, particularly in neurologic Lyme disease, but they appear to be uncommon compared with anxiety, cognitive dysfunction, intrusive thoughts, depersonalization, and derealization.
Because hallucinations and psychosis have many possible neurologic, infectious, metabolic, medication-related, and psychiatric causes, prompt medical evaluation is essential whenever these symptoms develop.
Why These Symptoms May Occur Without Prior Mental Health Problems
Some patients experiencing depersonalization, derealization, anxiety, or intrusive thoughts report no previous psychiatric diagnosis. Symptoms may begin abruptly during active infection, relapse, or worsening neurologic illness.
This pattern is consistent with an infection-related neurologic contribution in some patients, although it does not exclude primary psychiatric disorders or other medical conditions. A comprehensive evaluation remains important.
Important Clinical Note
Suicidal thoughts or thoughts of harming others should always prompt immediate medical and psychiatric evaluation, regardless of the underlying cause.
Because depersonalization, derealization, anxiety disorders, obsessive-compulsive disorder, and psychotic illnesses can overlap clinically, collaboration between infectious disease, neurology, primary care, and mental health professionals is often appropriate.
Frequently Asked Questions
Can Lyme disease cause depersonalization?
Some patients with neurologic Lyme disease describe feeling detached from themselves or emotionally disconnected from their surroundings. Although this symptom is not unique to Lyme disease, it has been reported in the medical literature and observed in clinical practice.
Can Lyme disease cause derealization?
Derealization has been reported in some patients with Lyme disease, particularly when neurologic symptoms or autonomic dysfunction are present. Patients generally retain insight and recognize that the experience is abnormal.
Can Lyme disease cause intrusive thoughts?
Some patients report unwanted or repetitive thoughts during active neurologic illness. These symptoms should always be evaluated within the broader clinical picture because they are not specific to Lyme disease.
Clinical Takeaway
Depersonalization, derealization, anxiety, cognitive dysfunction, and intrusive thoughts are among the neuropsychiatric symptoms reported in some patients with Lyme disease and may reflect disruptions in immune signaling, brain network function, and autonomic regulation.
These symptoms are often frightening but commonly occur with preserved insight and should not automatically be interpreted as evidence of psychosis. Because similar symptoms can arise from many medical and psychiatric conditions, careful evaluation is essential.
Recognizing these symptoms early may help patients receive appropriate neurologic, psychiatric, and infectious disease evaluation while reducing unnecessary fear and stigma.
Related Articles
Neurologic Lyme disease
Autonomic dysfunction in Lyme disease
Neuropsychiatric manifestations of Lyme disease
Lyme disease symptoms guide
References
- Fallon BA. Psychiatric manifestations of Lyme borreliosis. Am J Psychiatry. 1993.
- Fallon BA. Lyme disease: a neuropsychiatric illness. Psychiatr Clin North Am. 1994.
- Blanc F, et al. Neurologic and psychiatric manifestations of Lyme disease. Med Mal Infect. 2007.
- Bransfield RC. Neuropsychiatric Lyme Borreliosis: An Overview with a Focus on a Specialty Psychiatrist’s Clinical Practice. Healthcare (Basel). 2018.
- Hündersen F, Forst S, Kasten E. Neuropsychiatric and Psychological Symptoms in Patients with Lyme Disease: A Study of 252 Patients. Healthcare (Basel). 2021.
- Šegždaitė G, Aliukonytė O, Pociūtė K. Neuropsychiatric Manifestations of Lyme Disease: A Literature Review of Psychiatric and Cognitive Impacts. Acta Med Litu. 2025.
- Halperin JJ. Lyme disease and the peripheral nervous system. Muscle Nerve. 2003.
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
