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

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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 6,167 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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517 studies

E0 — Consensus643E1 — Replicated320E2 — Moderate2,782E3 — Preliminary2,422

ME/CFS4,025Long COVID217Post-infectious189Overlapping1,050

Required for diagnosis414Not specified / unclear2,219Not required3,534

Post-Exertional Malaise1,064Cognitive Dysfunction1,735Pain1,620Unrefreshing Sleep799Orthostatic Intolerance478

Cytokines818Gene Expression567Metabolomics473Neuroimaging468Autoantibodies458

Infection-Triggered1,174Long COVID Overlap588Pediatric493Severe231

Strong Phenotyping438Sex-Stratified326Severe ME Included118

Systematic Review265Meta-Analysis60RCT300

Peer-reviewed6,110Preprint3Unclear54

461–480 of 517 studies

E3 PreliminaryGuidelinePEM not requiredGuideline

Chronic fatigue syndrome. Committee for Science and Education, Medical Association of South Africa.

South African medical journal = Suid-Afrikaanse tydskrif vir geneeskunde·1995

A group of South African medical experts created guidelines to help doctors recognize and treat chronic fatigue syndrome (CFS). The guidelines outline what symptoms and test results might help diagnose CFS, and suggest reasonable ways to manage the condition while keeping costs reasonable. However, the experts disagreed significantly about whether CFS is a real, distinct illness.

E3 PreliminaryReviewPEM unclearReview-Narrative

Neurasthenia, myalgic encephalitis or cryptogenic chronic fatigue syndrome?

Leitch, A G·QJM : monthly journal of the Association of Physicians·1995

This 1995 paper explores the history and naming of ME/CFS, comparing three different terms used to describe the condition: neurasthenia (an older term), myalgic encephalitis, and chronic fatigue syndrome. The author examines how the same illness has been called different names over time and in different places, which can create confusion about what the condition actually is.

E3 PreliminaryReviewPEM unclearReview-Narrative

10 key questions answered on chronic fatigue syndrome.

Gantz, N M·Contemporary internal medicine·1995

This is an editorial article that addresses 10 frequently asked questions about chronic fatigue syndrome (ME/CFS). Rather than reporting new research data, the author discusses common questions patients and doctors have about the condition, its diagnosis, and management. The article aims to help clarify misconceptions and provide practical information about ME/CFS.

E3 PreliminaryReviewPEM unclearReview-Narrative

[Differential therapy of chronic fatigue syndrome].

Pankow, W, Feddersen, C O, von Wichert, P·Der Internist·1995

This 1995 study examines different treatment approaches for chronic fatigue syndrome. The authors review various therapeutic options that may help ME/CFS patients manage their symptoms. While specific details are limited due to the abstract not being available, this work represents an early clinical discussion of treatment strategies for this complex illness.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome].

Trinidad, E E, Ramírez-Ronda, C·Boletin de la Asociacion Medica de Puerto Rico·1994

Chronic Fatigue Syndrome (ME/CFS) is a long-lasting illness that causes extreme tiredness and affects an estimated 24% of people. It was officially defined as a medical condition in 1988 after doctors recognized increasing numbers of patients with similar symptoms. The condition is more common in women aged 20-50 and is currently treated with supportive care to help manage symptoms.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome].

Sternon, J, Decaux, G, Hoffmann, G·Revue medicale de Bruxelles·1994

This paper describes how doctors can diagnose ME/CFS using specific criteria and discusses what might cause the condition. The authors note that viral infections may trigger ME/CFS, and that anxiety or depression can make symptoms worse. Importantly, they found that some patients improve on their own after a few years, though most don't respond well to available treatments.

SleepDiagnostics

E3 PreliminaryCommentaryPEM unclearEditorial

Fibromyalgia, chronic fatigue syndrome, and myofascial pain syndrome.

Goldenberg, D L·Current opinion in rheumatology·1994

This 1994 review examined three related conditions—fibromyalgia, ME/CFS, and myofascial pain syndrome—that often overlap and remain poorly understood. The author noted that these conditions frequently occur alongside Lyme disease and other medical or psychiatric illnesses. New research at that time suggested that problems with how the central nervous system (the brain and spinal cord) processes signals might play a role in fibromyalgia and ME/CFS.

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 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 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 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 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 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 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 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 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 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 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.

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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.