Can Lyme Disease Cause Depression?

Depression and Lyme disease can overlap
Symptoms may be neurologic, inflammatory, or psychiatric
A careful history can change the diagnosis

Can Lyme disease cause depression? I want to share the story of a patient who almost fell through the cracks—not because people did not care, but because they stopped looking too soon. She was told she suffered from depression, but it turned out her symptoms were due to Lyme disease.

She came to my office after seeing three different doctors. Each time, she heard the same thing: “You’re probably just depressed.”

But something did not sit right with her—and it did not sit right with me either.

When the diagnosis does not tell the whole story

Depression is real. It is serious. But it is not the explanation for every symptom a patient experiences.

By the time this patient found me, her fatigue was overwhelming. Her joints ached unpredictably. Her thoughts were cloudy, and her memory was slipping in ways that felt frightening. She was not just sad or withdrawn. She was physically sick—and she knew it.

Still, because she had a history of depression, her new symptoms were brushed aside.

• Nobody asked about the pattern of her pain.
• Nobody noticed how it migrated from joint to joint.
• Nobody questioned why sleep did not restore her energy.
• Nobody considered that this could be something more.

How Lyme disease symptoms overlap with depression

Many symptoms of neuropsychiatric Lyme disease overlap with depression and other mental health conditions.

Once a label like depression—or any psychiatric diagnosis—is placed on a patient’s chart, everything that follows can become filtered through that lens.

Headaches were labeled stress. Fatigue was blamed on depression. Brain fog was dismissed as anxiety.

But medicine—and healing—require curiosity. They require us to ask:

What else could be going on?

When I sat down and listened to her full story, it was clear her symptoms did not fit neatly into a mental health box. They fluctuated, migrated, and worsened unpredictably—patterns we often see with infection and inflammation, not simply mood disorders.

So we dug deeper.

I ordered testing for Lyme disease.

And we found it.

Lyme disease does not always look the way we expect

One reason Lyme disease is so often missed is because it does not always present the way doctors are trained to recognize it.

There was no obvious tick bite, no bull’s-eye rash, and no early flu-like illness.

Instead, Lyme disease may present with depression, anxiety, chronic fatigue, cognitive decline, mood swings, or brain fog.

Because Lyme disease can affect the immune system, nervous system, joints, and brain, it creates a complicated picture that is easy to misread—especially when clinicians stop asking questions.

Can Lyme disease cause depression and other psychiatric symptoms?

Depression is not the only diagnosis that can mask an underlying Lyme infection.

I have seen patients misdiagnosed with:

• Anxiety disorders
• Panic attacks
• Bipolar disorder
• Obsessive-compulsive disorder
• Somatic symptom disorder
• Post-traumatic stress disorder

These are real conditions—and they deserve real attention.

At the same time, psychiatric symptoms have repeatedly been described in Lyme disease. Case reports, reviews, and larger epidemiologic studies have documented patients presenting with depression, panic attacks, cognitive complaints, fatigue, neuropathic symptoms, anxiety, and suicidal thoughts in the setting of Lyme disease or persistent symptoms following treatment.

A nationwide Danish cohort study involving more than 12,000 individuals diagnosed with Lyme borreliosis found increased rates of mental disorders, affective disorders, suicide attempts, and death by suicide compared with individuals without Lyme borreliosis. Although the absolute risk remained low, the findings reinforce the importance of monitoring psychiatric symptoms and maintaining a broad differential diagnosis.

Symptoms may include emotional instability, irritability, panic episodes, severe fatigue, cognitive slowing, and poor memory.

When we anchor too quickly to a psychiatric explanation, we can miss a medical illness or overlapping condition that deserves further evaluation. A careful history, symptom timeline, physical findings, and appropriate testing remain critical—particularly when symptoms fluctuate, migrate, or include neurologic and systemic features.

Treatment changed everything

When we treated my patient’s Lyme disease, her health started to return.

• Her energy came back
• Her brain fog lifted
• Her joint pain improved
• Her mood stabilized

Her mood improved not because she changed medications—but because her infection was finally being addressed.

She began feeling like herself again—regaining not only physical strength but also mental clarity and emotional resilience.

It confirmed what she had known deep down all along:

This was not just depression. This was Lyme disease.

If your symptoms do not add up, keep asking questions

If you are struggling with fatigue, brain fog, pain, mood changes, or symptoms that do not feel fully explained—and you have been told it is “just depression”—consider whether another explanation deserves consideration.

• Trust yourself
• Keep asking questions
• Find someone willing to look deeper

Because sometimes, the real diagnosis is still waiting to be found.

Frequently Asked Questions

Can Lyme disease cause depression?

Yes. Lyme disease may contribute to mood symptoms, fatigue, cognitive changes, sleep disruption, and neurologic symptoms that overlap with depression. Symptoms should be evaluated in the context of the full clinical picture.

Why is Lyme disease mistaken for depression?

Fatigue, poor concentration, memory issues, sleep disturbance, and low motivation overlap substantially between Lyme disease and depression, which can make diagnosis challenging.

Can Lyme disease cause anxiety and panic attacks?

Some patients with Lyme disease report anxiety, panic symptoms, irritability, autonomic symptoms, and neuropsychiatric complaints during illness.

What Lyme symptoms are less typical for depression?

Migratory pain, fluctuating symptoms, night sweats, neurologic symptoms, joint swelling, and symptom patterns tied to infection may raise suspicion for another diagnosis.

Clinical Takeaway

Depression deserves careful evaluation and treatment. But when symptoms fluctuate, migrate, or fail to fit the expected pattern, clinicians should reconsider whether another medical explanation may be contributing.

Sometimes the problem is not that patients stop asking questions—it is that clinicians stop asking them too soon.

Related Articles

These articles explore the overlap between psychiatric symptoms, neurologic Lyme disease, and delayed diagnosis.

Suicidal behaviors in patients with Lyme disease
16-year-old boy with Lyme disease presenting as depression
Neuropsychiatric Lyme disease
Lyme disease misdiagnosis

References

1. Fallon BA, Nields JA. Lyme disease: A neuropsychiatric illness. Am J Psychiatry. 1994;151(11):1571-1583.
2. Logigian EL, Kaplan RF, Steere AC. Chronic neurologic manifestations of Lyme disease. N Engl J Med. 1990;323:1438-1444.
3. Garakani A, Mitton AG. New-Onset Panic, Depression with Suicidal Thoughts, and Somatic Symptoms in a Patient with a History of Lyme Disease. Case Rep Psychiatry. 2015;2015:457947.
4. Fallon BA, Madsen T, Erlangsen A, Benros ME. Lyme Borreliosis and Associations With Mental Disorders and Suicidal Behavior: A Nationwide Danish Cohort Study. Am J Psychiatry. 2021;178(10):921-931.

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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