When to Suspect Lyme Disease in Children

Lyme disease should be considered in children who develop unexplained fatigue, joint pain, headaches, or behavioral changes after spending time outdoors in tick-endemic areas. Because children often present differently than adults, early signs may be subtle and easily mistaken for common childhood conditions.

Children ages 5–14 represent one of the highest incidence groups for Lyme disease in the United States. Yet pediatric Lyme disease is frequently overlooked because symptoms may evolve gradually and may not include a recalled tick bite or classic bull’s-eye rash.

This article explains when clinicians and parents should suspect Lyme disease in children and when further evaluation may be warranted.

Common Early Signs of Lyme Disease in Children

The early symptoms of Lyme disease in children often resemble viral illness or routine childhood complaints. However, certain patterns should raise suspicion.

• Fatigue or sudden loss of stamina
• Headaches or neck stiffness
• Muscle aches or joint pain
• Fever or flu-like symptoms
• Unusual irritability or mood changes
• Sleep disturbances

Some children develop a rash called erythema migrans. However, the rash may not always resemble the classic bull’s-eye pattern and may appear in areas that are difficult to see.

Learn more about Lyme disease rashes.

Clinical Situations That Should Raise Suspicion

Certain clinical scenarios should prompt consideration of Lyme disease in children, particularly in endemic regions.

• New swelling of a single large joint, especially the knee
• Facial nerve palsy without another clear cause
• Severe or persistent headaches
• Unexplained fatigue lasting weeks
• Neurologic symptoms such as dizziness or balance problems
• Symptoms following outdoor exposure during tick season

When these findings occur in children living in or traveling to endemic regions, Lyme disease should remain in the differential diagnosis.

Symptoms That May Appear Later

If Lyme disease progresses, symptoms may involve multiple body systems.

• Migratory joint pain or swelling
• Limping or swelling of a knee
• Facial palsy
• Dizziness or lightheadedness
• Difficulty concentrating or memory problems
• Brain fog

Some children develop symptoms of autonomic dysfunction, including dizziness, racing heart, or exercise intolerance.

School Changes May Be an Early Clue

In some children, Lyme disease first becomes apparent through academic or behavioral changes.

Parents and teachers may notice:

• Declining school performance
• Difficulty concentrating
• Memory problems
• Increased irritability or anxiety
• Reduced participation in activities

Adolescents with Lyme disease may develop cognitive symptoms affecting memory and executive function. One study found measurable deficits in memory and executive functioning in adolescents with post-treatment Lyme disease (McAuliffe et al.).

Learn more about how Lyme disease affects school performance.

Tick Bites Are Often Not Seen

One reason Lyme disease is frequently missed in children is that many patients never recall a tick bite.

Nymph ticks—the stage most responsible for transmission—are extremely small, often about the size of a poppy seed. They can attach in hidden areas such as the scalp, groin, or behind the knees and may go unnoticed.

Research shows that only a minority of children diagnosed with Lyme disease recall a tick bite (Nigrovic et al.).

See why many children never see the tick that infected them.

Seasonal Pattern of Pediatric Lyme Disease

Many pediatric Lyme disease cases occur during late spring and summer when nymph ticks are most active, although infections can occur throughout the year.

Risk is highest in regions where Lyme disease is common, including the Northeast, Mid-Atlantic, Upper Midwest, and parts of the West Coast.

When Lyme Disease Should Be Considered

Clinicians should consider Lyme disease in children when symptoms appear after outdoor exposure in tick-endemic regions and cannot be explained by another condition.

• Unexplained knee swelling
• Persistent fatigue after outdoor exposure
• New neurologic symptoms such as facial palsy
• Sudden decline in school performance
• Symptoms that fluctuate or migrate

Lyme disease should remain on the differential diagnosis even when a tick bite was not seen or when early laboratory testing is negative.

Learn more about Lyme disease testing limitations.

Why Pediatric Lyme Disease Is Often Missed

Several factors contribute to delayed recognition in children.

• No remembered tick bite
• Rash not recognized or absent
• Symptoms attributed to viral illness or stress
• Early testing with limited sensitivity

Because Lyme disease can mimic many other conditions, clinicians must rely on careful clinical evaluation and exposure history.

Conditions That May Be Considered During Evaluation

Many conditions can produce symptoms similar to Lyme disease in children. When evaluating a child with unexplained fatigue, headaches, behavioral changes, or neurologic symptoms, clinicians may consider several possible diagnoses.

These may include:

• Postural orthostatic tachycardia syndrome (POTS)
• Pediatric acute-onset neuropsychiatric syndrome (PANS)
• Functional neurological disorders, including functional seizures
• Primary psychiatric conditions such as anxiety or depression
• New-onset behavioral or cognitive disorders
• Viral or post-viral fatigue syndromes

Some of these conditions may occur independently, while others may share overlapping symptoms with tick-borne illness. Careful clinical evaluation helps determine the most likely explanation for a child’s symptoms.

Clinical Perspective

In my practice, parents often recognize subtle changes before clear physical symptoms appear. A child may stop participating in sports, struggle to concentrate in school, or complain of persistent headaches.

Parents often notice subtle changes first—a child who suddenly avoids sports, complains of headaches after school, or becomes unusually fatigued.

When these changes occur after outdoor exposure in endemic regions, Lyme disease should remain part of the diagnostic consideration.

Early recognition allows timely treatment and may reduce the risk of prolonged illness.

Related Pediatric Lyme Disease Articles

• Pediatric Lyme Disease Guide
• Children With Lyme Disease: Symptoms and School Impact
• Why Lyme Disease Affects School Performance
• Only a Minority of Children Recall a Tick Bite
• POTS in Children With Lyme Disease

References

• Nigrovic LE, Neville DN, Balamuth F, et al. A minority of children diagnosed with Lyme disease recall a preceding tick bite. Ticks and Tick-borne Diseases. 2019.
• Centers for Disease Control and Prevention.
  Lyme Disease Data and Surveillance.
• McAuliffe P, Brassard MR, Fallon BA.
  Memory and executive functions in adolescents with posttreatment Lyme disease. Appl Neuropsychol. 2008;15(3):208–219. doi:10.1080/09084280802324473.