Pediatric Lyme Disease: Symptoms, Diagnosis, and Challenges

“My child wasn’t acting like themselves—but we didn’t know why.”

Pediatric Lyme disease can present differently than adult Lyme disease, often with subtle or evolving symptoms that are difficult to recognize early.

Quick Answer: Lyme disease in children may cause fatigue, headaches, joint pain, and cognitive or behavioral changes that can fluctuate over time.

Clinical Insight: Children often do not recall a tick bite, and symptoms may be mistaken for viral illness, stress, or developmental changes.

Because symptoms can shift over time and involve multiple systems, diagnosis is sometimes delayed.

Understanding how Lyme disease presents in children can help identify patterns earlier and avoid misdiagnosis.

Common symptoms of pediatric Lyme disease

Children with Lyme disease may present with a wide range of symptoms, including:

Fatigue and reduced activity
Headaches
Joint pain or swelling
Fever or flu-like symptoms
Difficulty concentrating
Behavioral or mood changes

These symptoms may not appear all at once and can fluctuate over time.

Many of these symptoms overlap with broader patterns described in the Lyme disease symptoms guide.

In some children, these symptoms can also interfere with learning and school performance. Learn more in Lyme disease in children and its impact on school.

Sudden behavioral changes in pediatric Lyme disease

In some children, Lyme disease and other infections may trigger sudden-onset behavioral or psychiatric symptoms.

These can include anxiety, obsessive-compulsive behaviors, irritability, emotional dysregulation, or regression in school performance.

This pattern has been described in conditions such as pediatric acute-onset neuropsychiatric syndrome (PANS), where infection-triggered immune responses affect brain function.

These findings support a broader clinical concept: in certain cases, behavioral symptoms may reflect infection-triggered neuroinflammation rather than a primary psychiatric disorder.

This overlap may delay diagnosis when symptoms are evaluated in isolation rather than as part of a multisystem illness.

Related patterns are discussed in neuropsychiatric Lyme disease.

Why pediatric Lyme disease is often missed

Several factors contribute to delayed or missed diagnosis in children:

Tick bites are often unnoticed
The classic rash may be absent or missed
Symptoms may mimic common childhood illnesses
Behavioral changes may be attributed to stress or development

These patterns contribute to Lyme disease misdiagnosis and may delay appropriate treatment.

Learn more about delayed Lyme disease diagnosis.

The role of neuroinflammation

Lyme disease can affect the nervous system and trigger neuroinflammation, which may influence cognition, mood, and behavior.

This process may contribute to symptoms such as brain fog, anxiety, irritability, and difficulty with attention.

These mechanisms are explored further in neuroinflammation in Lyme disease.

Diagnosis of pediatric Lyme disease

Diagnosis is based on a combination of clinical symptoms, exposure history, and laboratory testing.

However, early testing may be negative, particularly in the first weeks after infection.

Learn more about Lyme disease test accuracy and why timing matters.

Clinical takeaway

Pediatric Lyme disease can present with physical, cognitive, and behavioral symptoms that evolve over time.

When symptoms are sudden, fluctuating, or involve multiple systems, Lyme disease should be considered—especially in endemic areas.

Early recognition can help prevent delayed diagnosis and improve outcomes.

References

Frankovich J, Thienemann M, Pearlstein J, et al. Multidisciplinary clinic dedicated to treating youth with pediatric acute-onset neuropsychiatric syndrome: presenting characteristics of the first 47 consecutive patients. J Child Adolesc Psychopharmacol. 2015.

PubMed:

https://pubmed.ncbi.nlm.nih.gov/25816051/

PMC Full Text:

https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4340505/

Dr. Daniel Cameron, MD, MPH is a nationally recognized expert in Lyme disease and tick-borne illnesses and a past president of the International Lyme and Associated Diseases Society (ILADS).

This content is for educational purposes and is not a substitute for individualized medical care.

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