Skip to content

Start Here
Atlas
Evidence
Research
Ask
Updates
About
Support

Evidence Atlas

ME/CFS Atlas — A public knowledge atlas for ME/CFS

Start Here
Atlas
Evidence
Research
Ask
FAQ
Glossary
Updates
Methodology
Press
Retractions
Contribute
About
Support
Contact

Weekly research digest — no spam

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.

Generator v1·Scanner v1.4·Lint gate: enforce·See methodology

© 2026 ME/CFS Atlas

ME/CFS Evidence Browser — Classified Studies on Myalgic Encephalomyelitis

Evidence browser

Search and filter 6,145 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 →

Sort

510 studies

E0 — Consensus637E1 — Replicated320E2 — Moderate2,768E3 — Preliminary2,420

ME/CFS4,014Long COVID212Post-infectious189Overlapping1,045

Required for diagnosis412Not specified / unclear2,201Not required3,532

Post-Exertional Malaise1,055Cognitive Dysfunction1,723Pain1,612Unrefreshing Sleep793Orthostatic Intolerance474

Cytokines816Gene Expression567Metabolomics469Neuroimaging466Autoantibodies457

Infection-Triggered1,170Long COVID Overlap580Pediatric492Severe228

Strong Phenotyping435Sex-Stratified326Severe ME Included116

Systematic Review263Meta-Analysis60RCT300

Peer-reviewed6,088Preprint3Unclear54

461–480 of 510 studies

E3 PreliminaryReviewPEM unclearReview-Narrative

A brief history of chronic fatigue syndrome.

Kim, E·JAMA·1994

This is a historical review article that traces how chronic fatigue syndrome (ME/CFS) has been understood and described over time. The article examines the evolution of the condition from early medical descriptions through the modern era, helping readers understand how our knowledge of ME/CFS has changed. It provides context for why ME/CFS was named and recognized as a legitimate medical condition.

E3 PreliminaryCommentaryPEM not requiredEditorial

[Chronic fatigue syndrome and psychiatric diseases].

Matsuno, T, Hikita, K, Matsuo, T·Nihon rinsho. Japanese journal of clinical medicine·1994

This 1994 commentary discusses whether ME/CFS is actually a form of depression or a separate condition. The authors argue that ME/CFS is genuinely different from depression because people with ME/CFS remain motivated and don't show the emotional numbness seen in depression. Instead, ME/CFS involves fatigue that fluctuates sharply, along with persistent physical symptoms like malaise and low fevers.

E3 PreliminaryBehavioralPEM unclearCase-Control

Chronic fatigue syndrome or affective disorder? Implications of the diagnosis on management.

Giannopoulou, Joanna, Marriott, Sarah·European child & adolescent psychiatry·1994

This case study describes a teenage boy who was initially thought to have post-viral fatigue syndrome (a condition similar to ME/CFS that follows infections) but was actually diagnosed with bipolar disorder, a mental health condition involving extreme mood swings. The doctors discuss how difficult it can be to tell the difference between these two conditions in young people, and how getting the diagnosis wrong can seriously affect their treatment and development.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Treatment of the chronic fatigue syndrome. A review and practical guide.

Blondel-Hill, E, Shafran, S D·Drugs·1993

This 1993 guide explains that ME/CFS is a real illness defined by severe, disabling fatigue along with other physical and mental symptoms, though its exact cause remains unknown. The main treatment is getting a proper diagnosis, learning about the condition, and working with a caring doctor who understands it. Some patients may benefit from antidepressant medications even without depression, though no single treatment has been proven to work reliably for everyone.

E3 PreliminaryCohortPEM unclearCross-Sectional

Experience at a referral center for patients with suspected Lyme disease in an area of nonendemicity: first 65 patients.

Burdge, D R, O'Hanlon, D P·Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·1993

Doctors at a hospital created a special clinic to evaluate patients who thought they had Lyme disease, even though Lyme disease is not common in that region. Out of 65 patients referred to the clinic, only 2 actually had Lyme disease. However, the clinic successfully identified other real medical conditions in most patients, including rheumatologic diseases, infections, and chronic fatigue syndrome.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome: a critical review].

Cathébras, P, Bouchou, K, Charmion, S et al.·La Revue de medecine interne·1993

ME/CFS is a debilitating condition characterized mainly by extreme tiredness of unknown cause. Current diagnostic criteria don't clearly identify a single uniform group of patients, and no clear infectious or immune cause has been definitively proven, though some viruses and immune changes may play a role in some cases. Treatment options are limited but may include antidepressants and cognitive-behavioral therapy.

E3 PreliminaryCommentaryPEM not requiredEditorial

Chronic fatigue syndrome. A fresh look at an old problem.

McSherry, J·Canadian family physician Medecin de famille canadien·1993

This editorial discusses chronic fatigue syndrome (ME/CFS) as a real medical condition affecting about 3 in 100,000 people. Most patients experience symptoms for approximately 2.5 years before recovering to normal health. Since there is no single definitive test, doctors diagnose ME/CFS by ruling out other diseases, and currently no one treatment works for everyone.

E3 PreliminaryCommentaryPEM not requiredEditorial

Somatization, illness attribution and the sociocultural psychiatry of chronic fatigue syndrome.

Abbey, S E·Ciba Foundation symposium·1993

This paper explores how psychological factors, personal beliefs about illness, and social influences may play a role in ME/CFS. The author examines how things like perfectionism, how people cope with stress, and the way doctors and media talk about ME/CFS can affect whether someone develops the condition or how severe their symptoms become.

E3 PreliminaryCohortPEM unclear

[A case from practice (279). 1. Chronic fatigue syndrome (CFS). 2. Psychosocial problems].

Kiener, S·Schweizerische Rundschau fur Medizin Praxis = Revue suisse de medecine Praxis·1993

This is a case report from a Swiss medical practice describing a patient with chronic fatigue syndrome (CFS) and the psychological and social problems that came along with the condition. The doctor documented how CFS affected this patient's daily life, relationships, and mental health. This type of case study helps doctors recognize CFS in their own patients and understand the broader impact it has beyond just physical symptoms.

E3 PreliminaryDiagnosticPEM unclearMethods-Paper

From the Centers for Disease Control and Prevention. Inability of retroviral tests to identify persons with chronic fatigue syndrome, 1992.

JAMA·1993

In the early 1990s, researchers tested whether retroviruses (a type of virus) could be identified in people with ME/CFS using available blood tests. The CDC study found that these retroviral tests could not reliably identify or confirm ME/CFS in patients. This helped clarify that ME/CFS was not caused by the retroviruses being tested at that time.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chronic fatigue syndrome. Recent advances in diagnosis and treatment.

Bell, D S·Postgraduate medicine·1992

ME/CFS typically starts suddenly with severe tiredness and flu-like symptoms that come and go over months or years. While blood tests sometimes show immune system changes, doctors diagnose ME/CFS mainly by recognizing the pattern of symptoms and ruling out other illnesses. Current treatment focuses on managing symptoms and helping patients cope with this long-lasting, disabling condition.

InterventionsDiagnostics

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome--symptoms, signs, laboratory tests, and prognosis].

Kanayama, Y·Nihon rinsho. Japanese journal of clinical medicine·1992

This review article describes the main symptoms and characteristics of ME/CFS, including persistent fatigue lasting more than 6 months, low-grade fevers, swollen lymph nodes, muscle and joint pain, and mood-related symptoms. Since no specific blood test or scan can definitively diagnose ME/CFS, doctors must rule out other known causes of fatigue before making the diagnosis. The underlying cause remains unknown, though researchers suspect it may involve an infection combined with psychological factors.

E3 PreliminaryCohortPEM unclearObservational

[Chronic fatigue syndrome--51 cases in the Jikei University School of Medicine].

Hashimoto, N, Kuraishi, Y, Yokose, T et al.·Nihon rinsho. Japanese journal of clinical medicine·1992

This study identified 51 patients with ME/CFS diagnosed using official CDC criteria between 1991 and 1992. Most patients were women in their 20s–30s who had been seen by many doctors before receiving a correct diagnosis. Standard blood tests did not reveal abnormal findings, though some immune markers were mildly abnormal. About 57% of patients showed general improvement, and doctors used various medications to manage severe symptoms.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chronic fatigue syndrome.

Klonoff, D C·Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·1992

ME/CFS is a complex illness characterized by persistent fatigue and other symptoms, but doctors currently have no blood test or scan to diagnose it—they rely instead on what patients report. Research has identified that several factors may increase risk of developing ME/CFS, including viral infections, mental health conditions, and allergies, and studies show problems across multiple body systems including immune, nervous, hormone, and muscle function. While there is no cure yet, treatments like exercise, counseling, and medications can help manage some symptoms.

E3 PreliminaryReviewPEM unclearReview-Narrative

[Chronic fatigue syndrome: the present concept and historical perspective].

Kitani, T·Nihon rinsho. Japanese journal of clinical medicine·1992

This is an editorial article that reviews what ME/CFS (chronic fatigue syndrome) is and how our understanding of it has changed over time. The author examines the current definition of ME/CFS and discusses its history, helping readers understand how medical perspectives on this illness have evolved.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

[Diagnostic criteria for chronic fatigue syndrome by the CFS Study Group in Japan].

Kitani, T, Kuratsune, H, Yamaguchi, K·Nihon rinsho. Japanese journal of clinical medicine·1992

In 1992, Japanese researchers created new diagnostic guidelines to help doctors identify ME/CFS in their patients. These guidelines were based on earlier American standards but included some modifications, such as defining less severe cases and recognizing a form that develops after infections.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chronic fatigue syndrome. A review from the general practice perspective.

Holmwood, C, Shannon, C·Australian family physician·1992

This 1992 editorial confirms that ME/CFS is a real condition that significantly impacts people's quality of life, though the exact cause was not yet known. The authors suggest that treatment should focus on supportive counseling, explanation of the condition, psychiatric support when needed, and gradually increasing activity levels to help people return to normal functioning.

E3 PreliminaryReviewPEM unclearReview-Narrative

Chronic fatigue syndrome. A review from the general practice perspective.

Murdoch, J C·Australian family physician·1992

This 1992 review examines ME/CFS from the perspective of general practitioners (GPs) in Australia. The paper discusses how GPs can recognize, understand, and manage ME/CFS in their patients, highlighting the challenges of diagnosing a condition that doesn't show up on standard blood tests. It emphasizes that ME/CFS is a real medical condition deserving of proper clinical attention and patient support.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Definition of the chronic fatigue syndrome and its issues].

Hashimoto, N·Nihon rinsho. Japanese journal of clinical medicine·1992

This article reviews how ME/CFS was officially defined by the CDC in 1988 and identifies problems with that definition. The author points out that while the definition tries to rule out other conditions, it has trouble distinguishing ME/CFS from similar conditions like fibromyalgia and depression, and it's difficult to measure in real-world clinical practice.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue: myth or reality?].

Comtois, R·L'union medicale du Canada·1991

This 1991 review article addresses a fundamental question: Is chronic fatigue a real medical condition or just a perception? The authors acknowledge that while fatigue is one of the most common health complaints doctors hear, it can be difficult to diagnose and treat because we don't have simple blood tests like we do for cholesterol. The paper discusses how new diagnostic criteria for chronic fatigue syndrome were beginning to help doctors identify and manage this condition more effectively.

← Previous Next 20 studies →

Or browse by topic

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.