Mojarro Práxedes MD, Benjumea Pino P · Actas espanolas de psiquiatria · 1999
This study looked at fatigue in 277 medical students to see how common chronic fatigue syndrome (CFS) and a related condition called neurasthenia actually are. The researchers found that while over one-third of students reported fatigue, very few met the strict criteria for CFS (less than 1%), and a small number met criteria for neurasthenia (about 3%). The study also found that students with fatigue were more likely to have depression symptoms, though it's unclear whether depression causes fatigue or results from it.
This study provides epidemiological data on the rarity of CFS diagnoses despite common fatigue complaints in a general population, highlighting the distinction between fatigue as a symptom and CFS as a defined condition. Understanding the relationship between fatigue, depression, and cognitive difficulties is relevant for researchers investigating ME/CFS pathophysiology and for clinicians evaluating fatigued patients.
This study does not establish whether depression causes fatigue, results from fatigue, or shares a common underlying mechanism—only that they co-occur. The cross-sectional design cannot determine causality or longitudinal patterns. The study's reliance on questionnaires without clinical examination means participants meeting criteria on paper may not have had confirmed diagnoses in a clinical setting.
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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