Natural course of chronic fatigue syndrome/myalgic encephalomyelitis in adolescents.
Norris, Tom, Collin, Simon M, Tilling, Kate et al. · Archives of disease in childhood · 2017 · DOI
Quick Summary
This study followed teenagers in the UK from ages 13 to 18 to understand what happens to disabling fatigue that lasts 6 months or longer. The researchers found that while more teenagers reported this kind of fatigue as they got older, about 75% of those with persistent fatigue at age 13 felt better by age 16. Only about 8% of teenagers had this disabling fatigue throughout their entire teenage years.
Why It Matters
Understanding the natural course of ME/CFS in adolescents is critical because most existing research involves small samples or short follow-up periods. This large longitudinal study provides evidence that most teenagers with disabling fatigue improve over time, offering hope to patients and families while also identifying the minority who experience persistent symptoms requiring ongoing support.
Observed Findings
Prevalence of chronic disabling fatigue increased from 1.47% at age 13 to 2.99% at age 18.
Approximately 75% of adolescents with disabling fatigue at age 13 no longer met criteria at age 16.
Similar recovery rates (75%) were observed between ages 16 and 18.
Only 8.02% of those with chronic disabling fatigue at age 13 had persistent symptoms throughout adolescence.
Prevalence continued to increase even as individual remission rates remained high, suggesting new cases emerged over time.
Inferred Conclusions
Persistent chronic disabling fatigue is relatively rare in adolescents, with most recovering within 2-3 years.
The increasing overall prevalence from age 13 to 18 suggests new cases emerge during late adolescence despite high individual recovery rates.
The natural history of CFS/ME-like symptoms in adolescents differs markedly from adult presentations, with generally more favorable outcomes.
Remaining Questions
What factors distinguish adolescents who recover from those with persistent symptoms?
Do adolescents with persistent fatigue differ in symptom severity, additional health conditions, or psychosocial factors compared to those who recover?
What This Study Does Not Prove
This study does not confirm clinical diagnoses of CFS/ME, as it identified cases through self-reported fatigue rather than medical evaluation. The findings cannot explain why some adolescents recover while others develop persistent fatigue, nor can they identify specific factors that predict better or worse outcomes. The results may not apply to adolescents who received earlier medical diagnoses or treatment.
Tags
Symptom:Fatigue
Phenotype:Pediatric
Method Flag:PEM Not DefinedWeak Case DefinitionNo Controls