Lyme Disease Misdiagnosed as OCD: When Psychiatric Symptoms Have an Infectious Cause

Quick Answer: Lyme disease can be misdiagnosed as OCD when neuropsychiatric symptoms—such as obsessive thoughts, anxiety, and insomnia—are caused by infection rather than a primary psychiatric disorder.

Clinical Insight: When psychiatric symptoms appear suddenly, worsen rapidly, or fail to respond to treatment, an underlying infection such as Lyme disease should be considered.

She came in with a diagnosis of OCD—but nothing was working.

Her symptoms escalated quickly: racing thoughts, compulsions, insomnia, and sensory overload. Multiple psychiatric medications provided no relief.

The turning point? Lyme disease had never been considered.

Why Lyme Disease Is Misdiagnosed as OCD

Lyme disease and tick-borne infections can affect the brain and nervous system, leading to psychiatric symptoms that resemble primary mental health disorders.

These may include:

Obsessive thoughts and compulsive behaviors
Anxiety, panic attacks, or depression
Mood swings or irritability
Sensory hypersensitivity
Sleep disturbance or insomnia

When these symptoms are viewed in isolation, they are often labeled as psychiatric conditions rather than part of a broader neurologic pattern.

See the broader neurologic Lyme disease spectrum.

Neuropsychiatric Lyme Symptoms Are Often Overlooked

Lyme disease has been associated with a wide range of psychiatric symptoms, including:

Depression
Anxiety and panic
Emotional instability
OCD-like behaviors
Dissociation or derealization

These symptoms may reflect neuroinflammation rather than a primary psychiatric disorder.

Co-infections such as Bartonella are particularly associated with psychiatric symptoms, including rage, intrusive thoughts, and heightened emotional responses.

In children, this presentation may be labeled as PANS or PANDAS. In adults, it is often diagnosed as anxiety or OCD—without considering infection.

Case Example: When the Diagnosis Changes

A patient presented with worsening obsessive thoughts, insomnia, and sensory overload.

Testing revealed:

Elevated Bartonella antibodies
Reactive bands on Lyme Western blot

Treatment focused on infection rather than psychiatric medication alone.

Over time, the obsessive symptoms gradually improved.

This case highlights how Lyme disease can mimic OCD—and how diagnosis may change when infection is considered.

When to Reconsider the Diagnosis

Clinicians may consider Lyme disease when:

Symptoms begin suddenly or follow an illness
There are accompanying physical symptoms (fatigue, dizziness, night sweats)
The patient has possible tick exposure
Symptoms do not respond to standard psychiatric treatment

A psychiatric diagnosis does not rule out an underlying medical cause.

Learn more about delayed Lyme disease diagnosis.

The Cost of a Missed Diagnosis

When Lyme disease is misdiagnosed as OCD, patients may experience prolonged suffering, ineffective treatment, and delayed recovery.

The diagnosis may appear correct—until the broader clinical picture is recognized.

Clinical Takeaway

Lyme disease can mimic OCD and other psychiatric conditions.

When symptoms are sudden, atypical, or resistant to treatment, clinicians should consider whether an underlying infection could explain the presentation.

Recognizing this possibility can lead to more accurate diagnosis and appropriate care.