E2 ModerateModerate confidencePEM not requiredObservationalPeer-reviewedMachine draft
Standard · 3 min
Course of fatigue among patients previously hospitalised due to COVID-19.
Mazurkiewicz, Iwona, Chatys-Bogacka, Żaneta, Słowik, Joanna et al. · Neurologia i neurochirurgia polska · 2023 · DOI
Quick Summary
This study followed 204 people who were hospitalized with COVID-19 and tracked their fatigue symptoms over time. Before COVID-19, about 44% reported fatigue symptoms, but after infection, this jumped to 77% within 4 weeks. Even more than 12 weeks later, 66% still had fatigue—higher than before they got sick. Women were more likely to report fatigue than men.
Why It Matters
This study provides evidence that post-COVID fatigue affects a substantial proportion of previously hospitalized patients and persists beyond 12 weeks, supporting recognition of post-COVID fatigue as a clinically significant condition. The identification of sex-based differences in fatigue burden may inform patient stratification and clinical management strategies in both post-COVID and ME/CFS populations.
Observed Findings
Fatigue prevalence increased from 43.62% before COVID-19 to 76.96% within 4 weeks post-infection, with 75.49% affected at 4-12 weeks and 66.17% beyond 12 weeks.
Female sex was an independent predictor of greater fatigue symptom burden at both 0-12 weeks [β 0.25, p<0.001] and beyond 12 weeks [β 0.26, p<0.001].
Younger age predicted fewer fatigue symptoms only in the first 4 weeks post-infection [β -0.12, p=0.029].
Self-reported lymph node enlargement was the only fatigue-related symptom that returned to baseline levels beyond 12 weeks.
Most comorbidities were metabolic or cardiovascular (hypertension 44.61%, obesity 36.27%, hypercholesterolemia 21.08%).
Inferred Conclusions
Most patients hospitalized for COVID-19 experience persistent fatigue beyond 12 weeks, though symptom prevalence gradually declines from peak acute phase levels.
Female sex is a consistent demographic risk factor for prolonged fatigue burden across both acute and chronic post-COVID phases.
Age influences fatigue primarily during the acute phase (first 4 weeks), suggesting different pathophysiological mechanisms may operate in early versus persistent fatigue.
Remaining Questions
Does this post-COVID fatigue meet full diagnostic criteria for ME/CFS (including post-exertional malaise, unrefreshing sleep, and cognitive dysfunction), or does it represent a distinct post-viral fatigue syndrome?
What This Study Does Not Prove
This study does not establish causation between COVID-19 and fatigue—only temporal association. It cannot determine whether fatigue represents true ME/CFS (which requires specific diagnostic criteria including post-exertional malaise) or a broader post-viral syndrome, since only eight chronic fatigue syndrome symptoms were assessed without full diagnostic criteria validation. The retrospective nature means symptom recall bias may have affected reported baseline and early-phase prevalence.
Tags
Symptom:Fatigue
Phenotype:Infection-TriggeredLong COVID Overlap
Method Flag:PEM Not DefinedWeak Case DefinitionNo Controls
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 →