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ME/CFS Atlas is an evidence reference platform, not a medical provider. Content is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.

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ME/CFS Evidence Browser — Classified Studies on Myalgic Encephalomyelitis

Evidence browser

Search and filter 6,205 studies by evidence level, diagnostic criteria, PEM status, and research domain. Each entry links to the original source.

Studies sorted by evidence level, then year. Browse by topic instead →

Evidence level (E0–E3) reflects study type and replication, not methodological quality. A weak systematic review still sits at E0. How evidence levels work →

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533 studies

E0 — Consensus654E1 — Replicated321E2 — Moderate2,807E3 — Preliminary2,423

ME/CFS4,040Long COVID224Post-infectious190Overlapping1,064

Required for diagnosis417Not specified / unclear2,251Not required3,537

Post-Exertional Malaise1,082Cognitive Dysfunction1,749Pain1,628Unrefreshing Sleep805Orthostatic Intolerance484

Cytokines821Gene Expression573Metabolomics477Neuroimaging472Autoantibodies460

Infection-Triggered1,182Long COVID Overlap604Pediatric496Severe232

Strong Phenotyping445Sex-Stratified330Severe ME Included119

Systematic Review272Meta-Analysis61RCT301

Peer-reviewed6,148Preprint3Unclear54

381–400 of 533 studies

E3 PreliminaryCohortPEM unclearCross-Sectional

A discourse analytic study of ME/CFS (Chronic Fatigue Syndrome) sufferers' experiences of interactions with doctors.

Guise, Jennie, McVittie, Chris, McKinlay, Andy·Journal of health psychology·2010

This study looked at how ME/CFS patients describe their experiences when talking to doctors. Researchers analyzed conversations from an online support group and found that patients often feel their doctors don't listen to them or take their condition seriously. Interestingly, patients were careful about how they complained, trying to focus on practical issues rather than seeming like they were just complaining.

E3 PreliminaryCohortPEM unclearCross-Sectional

Chronic fatigue syndrome/myalgic encephalomyelitis (CFS/ME) in adults: a qualitative study of perspectives from professional practice.

Horton, Simon M C, Poland, Fiona, Kale, Swati et al.·BMC family practice·2010

This study spoke with six healthcare providers who were praised by ME/CFS patients for being helpful and understanding. The researchers asked these doctors and specialists what they thought worked best when treating ME/CFS. The key finding was that patients benefit most from doctors who truly listen, show respect, build trust, and recognize how serious and complex the condition is—rather than those who dismiss or minimize ME/CFS.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

The Hebrew version of the FibroFatigue scale: validation of a questionnaire for assessment of fibromyalgia and chronic fatigue syndrome.

Ablin, Jacob N, Odes, Lisa, Neumann, Lily et al.·Rheumatology international·2010

This study tested whether a Hebrew-language questionnaire called the FibroFatigue Scale (FFS) accurately measures symptoms in fibromyalgia patients. Researchers gave 100 patients with fibromyalgia this questionnaire along with other standard symptom-measuring tools, and found that the FFS reliably detected and measured how severe their symptoms were.

E3 PreliminaryCohortPEM not requiredObservational

Making the diagnosis of Chronic Fatigue Syndrome/Myalgic Encephalitis in primary care: a qualitative study.

Chew-Graham, Carolyn, Dowrick, Christopher, Wearden, Alison et al.·BMC family practice·2010

This study asked 22 general practitioners (GPs) about their experiences diagnosing ME/CFS in their clinics. GPs said they find it hard to understand what ME/CFS is, and they typically focus on ruling out other diseases rather than confidently saying a patient has ME/CFS. Many GPs worried that giving someone an ME/CFS diagnosis might actually harm them, and they weren't sure what to do to help these patients once diagnosed.

E3 PreliminaryReviewPEM unclearReview-Narrative

Fibromyalgia: pathogenetic, diagnostic and therapeutic concerns.

Podolecki, Tomasz, Podolecki, Andrzej, Hrycek, Antoni·Polskie Archiwum Medycyny Wewnetrznej·2009

Fibromyalgia is a condition causing widespread muscle and joint pain that affects many people worldwide. This review examines what we know about fibromyalgia's causes, how doctors diagnose it, and how it can be treated. The authors note that fibromyalgia likely results from multiple factors involving the nervous system, brain chemistry, and immune function, and that treatment typically involves antidepressants, therapy, and other approaches.

Pain and SensitizationDiagnostics

E3 PreliminaryReviewPEM unclearReview-Narrative

[Changes on definition and diagnostic criteria of the chronic fatigue syndrome].

Qin, You, Pang, Feng-Shun, Cai, Bei-Yuan·Zhongguo Zhong xi yi jie he za zhi Zhongguo Zhongxiyi jiehe zazhi = Chinese journal of integrated traditional and Western medicine·2009

This article reviews how the definition and diagnostic criteria for ME/CFS have changed over time. The authors examine the evolution of how doctors identify and classify this condition using different diagnostic frameworks. Understanding these changes helps patients and doctors communicate more clearly about the disease.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Functional somatic syndromes from the view of cultural anthropology].

Nakagami, Ayako, Tsujiuchi, Takuya·Nihon rinsho. Japanese journal of clinical medicine·2009

This study explains how culture and society shape the way people experience and describe illnesses like ME/CFS. The authors point out that doctors and patients often understand illness differently—doctors focus on what they can measure (disease), while patients focus on how the illness affects their daily life (illness). Understanding these different viewpoints can help doctors and patients communicate better and work together.

E3 PreliminaryPEM not required

Obstructions for quality care experienced by patients with chronic fatigue syndrome (CFS)--a case study.

Gilje, Ann Marit, Söderlund, Atle, Malterud, Kirsti·Patient education and counseling·2008

This study asked 12 ME/CFS patients about their experiences with doctors and healthcare. Patients reported that doctors often didn't believe them, didn't listen carefully, or treated them dismissively. Many felt that doctors blamed their symptoms on psychological causes or didn't take them seriously, which was sometimes as painful as the illness itself.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

Bayesian biomarker identification based on marker-expression proteomics data.

Bhattacharjee, M, Botting, C H, Sillanpää, M J·Genomics·2008

This study developed statistical methods to find biological markers (biomarkers) that could help identify and diagnose ME/CFS. The researchers used blood protein measurements and genetic information from ME/CFS patients to find which markers are most closely linked to the disease. Finding these biomarkers is important because ME/CFS is currently hard to diagnose and measure, and having reliable biological tests could change that.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

A train-the-trainer education and promotion program: chronic fatigue syndrome--a diagnostic and management challenge.

Brimmer, Dana J, McCleary, K Kimberly, Lupton, Teresa A et al.·BMC medical education·2008

This study tested whether training primary care doctors about ME/CFS could help more patients get diagnosed and treated. Researchers trained 79 doctors and nurse practitioners to recognize and manage ME/CFS, and these trained providers then taught over 2,000 other healthcare workers. The training improved doctors' knowledge and confidence in diagnosing ME/CFS, showing that education programs can help address the problem of missed diagnoses.

E3 PreliminaryReviewPEM unclearReview-Narrative

[Contentious diseases--a medico-social phenomenon from an insurance medicine perspective].

Regenauer, A·Versicherungsmedizin·2008

This article examines a group of conditions—including ME/CFS, fibromyalgia, and others—that are difficult to diagnose with standard medical tests and have become controversial in healthcare and insurance systems. The author explores why these illnesses are questioned by insurers, what they have in common, and why cases are increasing in Western societies. The paper aims to help insurance companies better understand these conditions rather than dismiss them as imaginary.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Sub-health state and chronic fatigue syndrome].

Wang, Tian-Fang, Xue, Xiao-Lin·Zhongguo Zhong xi yi jie he za zhi Zhongguo Zhongxiyi jiehe zazhi = Chinese journal of integrated traditional and Western medicine·2008

This study clarifies that 'sub-health'—a state of feeling unwell that falls short of diagnosed disease—is different from ME/CFS. The authors explain what fatigue, chronic fatigue, and ME/CFS actually are, and discuss how doctors can tell them apart using established diagnostic criteria. Understanding these differences helps ensure people with ME/CFS receive appropriate diagnosis and care.

E3 PreliminaryReviewPEM unclearReview-Narrative

[History of chronic fatigue syndrome].

Hashimoto, Nobuya·Nihon rinsho. Japanese journal of clinical medicine·2007

This article reviews the history of ME/CFS, showing that conditions with similar symptoms have existed for hundreds of years under different names like neurasthenia and myalgic encephalomyelitis. A major outbreak at Lake Tahoe in the 1980s brought modern attention to the disease, but doctors realized that not all patients with CFS symptoms actually had evidence of EBV infection, suggesting the disease is more complex than a simple viral cause. The authors explain how understanding this history can help develop better diagnostic guidelines for the condition.

E3 PreliminaryPEM not required

[Chronic fatigue syndrome in a 15-year-old girl].

Díaz-Caneja Greciano, A, Rodríguez Sosa, J T, Aguilera Albesa, S et al.·Anales de pediatria (Barcelona, Spain : 2003)·2007

This report describes a 15-year-old girl diagnosed with ME/CFS (chronic fatigue syndrome), a condition that causes severe tiredness and lack of energy without an obvious physical cause. The doctors emphasize that ME/CFS should be considered when young people have chronic fatigue along with other symptoms but medical tests don't reveal why. Treatment focused on rehabilitation with cognitive behavioral therapy (talking therapy to address thoughts and behaviors) combined with a gradual, structured increase in activity levels.

E3 PreliminaryReviewPEM unclearReview-Narrative

Myalgic encephalomyelitis: a review with emphasis on key findings in biomedical research.

Hooper, M·Journal of clinical pathology·2007

This review examines what scientific research has discovered about ME/CFS, a complex illness that affects multiple body systems and causes long-lasting tiredness, pain, and other symptoms. The authors discuss not only the medical findings but also how disagreements and differing opinions among doctors and scientists have affected research and care for ME/CFS patients. They emphasize that these broader debates have real consequences for patients seeking answers and proper treatment.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Illnesses you have to fight to get: facts as forces in uncertain, emergent illnesses.

Dumit, Joseph·Social science & medicine (1982)·2006

This study examines why ME/CFS and multiple chemical sensitivity remain controversial and hard to get diagnosed. Researchers found that patients often struggle because doctors and institutions lack clear biological evidence for these illnesses, and they use scientific uncertainty as a reason to deny patients care and legitimacy. Patients have responded by documenting these exclusions and developing their own strategies to fight back.

E3 PreliminaryReviewPEM unclearReview-Narrative

[The chronic fatigue syndrome and its diagnosis in internal medicine].

Barbado Hernández, F J, Gómez Cerezo, J, López Rodríguez, M et al.·Anales de medicina interna (Madrid, Spain : 1984)·2006

This article reviews how chronic fatigue syndrome (ME/CFS) is diagnosed and understood within internal medicine practice. The authors discuss the clinical features, diagnostic criteria, and challenges that doctors face when identifying ME/CFS in patients. The paper helps physicians recognize and properly diagnose this condition in their everyday practice.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome].

Maoz, Daniel, Shoenfeld, Yehuda·Harefuah·2006

ME/CFS is a serious illness that causes extreme tiredness and other symptoms that interfere with daily life. Doctors often fail to diagnose it correctly, and we still don't fully understand what causes it. This review suggests that ME/CFS likely results from multiple different factors working together, and that two treatments—cognitive behavioral therapy and graded exercise therapy—might help some patients.

E3 PreliminaryDiagnosticPEM unclearCross-Sectional

The validity of an empirical delineation of heterogeneity in chronic unexplained fatigue.

Aslakson, Eric, Vollmer-Conna, Uté, White, Peter D·Pharmacogenomics·2006

Researchers used statistical methods to identify distinct groups among people with chronic unexplained fatigue, including those with ME/CFS. They tested whether these groups were real and consistent by running their analysis multiple ways. They found that the groups they identified were valid and matched well with established ME/CFS diagnostic criteria, suggesting that ME/CFS is not one single condition but rather several related conditions with potentially different underlying causes.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[The problem of fatigue in neurological disorders].

Kumor, Klaudiusz, Pierzchała, Krystyna·Wiadomosci lekarskie (Warsaw, Poland : 1960)·2006

Fatigue is an extremely common and often severely disabling symptom in many neurological disorders, affecting 40–90% of patients with conditions like multiple sclerosis, Parkinson's disease, and stroke. This review explains that fatigue is a real medical symptom that should be carefully distinguished from depression, weakness, and sleepiness, though these conditions often occur together. Currently, doctors assess fatigue mainly through patient questionnaires, and there is no clear biological test or proven cure—treatments focus on addressing the underlying disease and using behavioral and psychological approaches.

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PEM Immune Neuro Metabolic Biomarkers Severe ME Long COVID Cognitive

Curated Collections

Thematic groupings by clinical question or research area.

Neuroinflammation Evidence

PET imaging and other studies providing evidence for brain inflammation in ME/CFS.

Metabolism & Mitochondria

Metabolomics and mitochondrial function studies revealing energy metabolism disruption.

Biomarkers

Studies identifying potential biological markers for ME/CFS diagnosis and stratification.

PEM-Specific Research

Studies specifically examining post-exertional malaise, the hallmark symptom of ME/CFS.