E2 ModerateModerate confidencePEM not requiredCross-SectionalPeer-reviewedReviewed
Standard · 3 min
Sociodemographic and symptom correlates of fatigue in an adolescent primary care sample.
Mears, Cynthia J, Taylor, Renee R, Jordan, Karen M et al. · The Journal of adolescent health : official publication of the Society for Adolescent Medicine · 2004 · DOI
Quick Summary
This study looked at how common fatigue lasting more than one month is in teenagers visiting primary care clinics. Researchers found that about 8% of teens had prolonged fatigue and 4.4% had symptoms matching CFS-like illness. Teens with prolonged fatigue were more likely to also experience headaches, muscle pain, fever, and fatigue that worsened with exercise.
Why It Matters
This study provides early epidemiological evidence that ME/CFS-like illness affects a meaningful proportion of adolescents in routine primary care settings. The identification of post-exertional fatigue as a key correlate aligns with contemporary understanding of ME/CFS pathophysiology and suggests clinicians should screen for this symptom pattern in fatigued adolescent patients.
Observed Findings
Prolonged fatigue (≥1 month duration) occurred in 8.0% of adolescents in primary care
CFS-like illness occurred in 4.4% of the adolescent sample
Adolescents with prolonged fatigue were significantly older than those without fatigue
Headaches, muscle pain, fever, and fatigue worsened by exercise were significantly associated with prolonged fatigue
Adolescents with prolonged fatigue reported greater fatigue severity than those without fatigue
Inferred Conclusions
Abnormal fatigue is a disabling and relatively prevalent condition in adolescents attending primary care
Multiple concurrent symptoms characterize prolonged fatigue in adolescents, suggesting possible viral or systemic origins
Increasing age is associated with higher risk of prolonged fatigue in this population
Post-exertional fatigue may be an important clinical marker of prolonged fatigue in adolescents
Remaining Questions
What are the long-term outcomes and natural history of prolonged fatigue in adolescents?
How do the symptom patterns and severity in this adolescent sample compare to formally-diagnosed ME/CFS cases using established criteria?
What This Study Does Not Prove
This study cannot establish causation or the underlying mechanisms of prolonged fatigue and CFS-like illness—it only describes associations. The CFS-like case definition was author-created and may not align with formal diagnostic criteria (e.g., Fukuda definition), limiting comparability to other studies. Cross-sectional design means temporal relationships cannot be determined.
About the PEM badge: “PEM required” means post-exertional malaise was an explicit required diagnostic criterion for participant inclusion in this study — not that PEM was studied, observed, or discussed. Studies using criteria that do not require PEM (e.g. Fukuda, Oxford) are tagged “PEM not required”. How the atlas works →
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What are the underlying biological mechanisms driving the association between post-exertional fatigue, viral-like symptoms, and prolonged fatigue in youth?
What role do psychosocial factors, sleep quality, and physical deconditioning play in the development and maintenance of prolonged fatigue in adolescents?