E3 PreliminaryWeak / uncertainPEM not requiredEditorialPeer-reviewedReviewed
Standard · 3 min
[Fatigue].
Reinhart, W H, Fleisch, F · Praxis · 2001
Quick Summary
Fatigue is a very common symptom that doctors see in many patients. This editorial discusses how doctors should evaluate someone with fatigue by taking a careful history, doing a physical exam, and ordering appropriate tests. When other diseases are ruled out, chronic fatigue syndrome may be diagnosed, though its causes remain unknown. The most proven treatments are graded exercise, cognitive behavioral therapy, and antidepressants if depression or anxiety are present.
Why It Matters
This editorial provides clinicians with a structured diagnostic framework for evaluating fatigue and contextualizes ME/CFS within the broader differential diagnosis of fatigue. It highlights that despite decades of clinical experience, the underlying mechanisms of ME/CFS remain unclear and reinforces the limited evidence base for most treatments beyond exercise, CBT, and symptom management.
Observed Findings
Fatigue is identified as one of the most frequent symptoms encountered in medical practice
Chronic fatigue syndrome diagnosis is made after underlying diseases are excluded
Established treatment options include graded exercise, antidepressants for comorbid mood disorders, and cognitive behavioral therapy
Many alternative treatments and dietary interventions lack proven efficacy
The pathogenesis of chronic fatigue syndrome remains largely unknown
Inferred Conclusions
A systematic diagnostic approach combining history, physical examination, and cost-effective laboratory/imaging testing is necessary to differentiate fatigue from underlying disease
When organic disease is excluded, chronic fatigue syndrome represents a diagnostic challenge with limited mechanistic understanding
Evidence-based treatment is restricted to a small number of interventions, leaving many patients without proven therapeutic options
Fatigue and chronic fatigue syndrome remain challenging problems for clinicians both diagnostically and therapeutically
Remaining Questions
What is the underlying pathophysiology and etiology of chronic fatigue syndrome?
What This Study Does Not Prove
This editorial does not present original research data, experimental findings, or outcome measures. It reflects 2001-era understanding and does not address post-exertional malaise (PEM) specifically or discuss post-viral mechanisms now recognized in ME/CFS research. The recommendations for graded exercise have since been questioned by patient-reported harm data and more recent mechanistic understanding.
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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