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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 6,145 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 →

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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

401–420 of 510 studies

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue: introduction].

Ducobu, J·Revue medicale de Bruxelles·2002

This review article explains that chronic fatigue is very common in general medical practice. Doctors need to first rule out other medical conditions that cause tiredness, then look for psychological factors and chronic fatigue syndrome (CFS). The key message is that careful clinical evaluation by a doctor is more important than ordering many laboratory tests to figure out what's causing someone's fatigue.

E3 PreliminaryCohortPEM unclearCross-Sectional

Women's experiences of stigma in relation to chronic fatigue syndrome and fibromyalgia.

Asbring, Pia, Närvänen, Anna-Liisa·Qualitative health research·2002

This study interviewed 25 women with ME/CFS or fibromyalgia about their experiences with stigma—being doubted, judged, or not taken seriously. Women reported that stigma was most common before they received a diagnosis, and that having many different symptoms made it harder for others to believe they were truly ill. People sometimes questioned whether the illnesses were real or blamed them on emotional problems rather than physical causes.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chiari type I malformation: overview of diagnosis and treatment.

Nash, John, Cheng, Joseph S, Meyer, Glenn A et al.·WMJ : official publication of the State Medical Society of Wisconsin·2002

Chiari Type I malformation is a condition where brain tissue extends into the spinal canal, potentially causing compression and various neurological symptoms. This review explains how doctors diagnose it using MRI imaging and discusses treatment options. The authors note that Chiari I symptoms can overlap significantly with ME/CFS and fibromyalgia, making diagnosis challenging, and they highlight controversy around whether surgery is appropriate for patients with these overlapping conditions.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome: the point of view of the internist].

Cogan, E·Revue medicale de Bruxelles·2002

This review examines how doctors approach patients with chronic fatigue. The authors note that most chronic fatigue cases stem from psychiatric conditions like depression and anxiety. A small group of patients have ME/CFS, which involves fatigue, mood and thinking problems, and various other physical symptoms—but doctors still don't know what causes it. Current treatments with limited evidence include antidepressants, talk therapy, and graded exercise programs.

E3 PreliminaryCohortPEM not requiredCross-Sectional

Evaluating attributions for an illness based upon the name: chronic fatigue syndrome, myalgic encephalopathy and Florence Nightingale disease.

Jason, Leonard A, Taylor, Renee R, Plioplys, Sigita et al.·American journal of community psychology·2002

This study asked medical trainees to read about a patient with ME/CFS symptoms, but gave different groups different names for the illness: "chronic fatigue syndrome," "myalgic encephalopathy," or "Florence Nightingale disease." Researchers found that the name used affected how seriously the trainees thought about the illness—specifically, "myalgic encephalopathy" sounded more serious than "chronic fatigue syndrome." This suggests that what doctors call a disease can influence how much they respect and understand it.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome. More and more differential diagnoses suggest a new view of this syndrome].

Merz, Susanne·Lakartidningen·2002

This review examines how ME/CFS is defined and diagnosed, and explains that several other medical conditions can look like ME/CFS but are actually different diseases. The authors highlight that many conditions—such as chronic infections, thyroid problems, and allergies—can cause similar symptoms to ME/CFS. They recommend that doctors carefully test patients to find the true cause of their symptoms rather than assuming everyone with severe fatigue has ME/CFS.

E3 PreliminaryBehavioralPEM not requiredCase-Control

[Symptom or illness? The exhausting life of an adolescent with chronic fatigue syndrome].

Di Gallo, A·Zeitschrift fur Kinder- und Jugendpsychiatrie und Psychotherapie·2002

This study describes the medical experience of a teenage boy diagnosed with chronic fatigue syndrome (CFS). The doctors examined questions about what causes CFS, how it develops, how to diagnose it, and what treatments might help. The case provides a detailed look at one patient's journey with this complex illness.

E3 PreliminaryDiagnosticPEM unclearMethods-Paper

Generation of classification criteria for chronic fatigue syndrome using an artificial neural network and traditional criteria set.

Linder, R, Dinser, R, Wagner, M et al.·In vivo (Athens, Greece)·2002

Researchers tested whether a computer program called an artificial neural network could help doctors better identify ME/CFS by looking at patient symptoms and comparing them to two other conditions that also cause fatigue: lupus and fibromyalgia. The computer program was very accurate—correctly identifying ME/CFS about 95% of the time—and worked better than traditional statistical methods for creating diagnostic rules.

E3 PreliminaryCommentaryPEM unclearEditorial

Environmental factors in medically unexplained symptoms and related syndromes: the evidence and the challenge.

Kipen, Howard M, Fiedler, Nancy·Environmental health perspectives·2002

This paper discusses how many patients experience symptoms that doctors cannot easily explain, and how these symptoms sometimes get organized into syndrome names like chronic fatigue syndrome. The authors note that these syndromes are defined only by how patients feel, not by medical tests, and that arguments continue about whether environmental factors cause them. They call for better research and clearer definitions to help both doctors and patients understand these conditions.

E3 PreliminaryCohortPEM unclearObservational

Doing things with illness. The micro politics of the CFS clinic.

Banks, J, Prior, L·Social science & medicine (1982)·2001

This study observed conversations between ME/CFS patients and doctors in a UK clinic to understand how they think about the condition differently. Patients and doctors often disagreed about whether ME/CFS is a disease of the body or the mind, and these disagreements shaped how treatment was discussed. The researchers found that these conversations were really about who gets to decide what ME/CFS actually is.

E3 PreliminaryCommentaryPEM unclearEditorial

[Syndromes in environmental medicine: variants of somatoform disorders].

Wiesmüller, G A, Ebel, H, Hornberg, C·Fortschritte der Neurologie-Psychiatrie·2001

This editorial discusses several conditions related to environmental sensitivities and stress, including ME/CFS, that doctors often struggle to diagnose or treat. The authors note that these conditions may result from a mix of environmental exposures, personal traits, stress, and how the mind interprets these experiences. They emphasize that while doctors don't yet have solid scientific ways to diagnose or treat these conditions, patients' symptoms deserve to be taken seriously.

E3 PreliminaryReviewPEM unclearReview-Narrative

Can fibromyalgia and chronic fatigue syndrome be cured by surgery?

Wilke, W S·Cleveland Clinic journal of medicine·2001

This review article examines whether surgery can cure fibromyalgia and chronic fatigue syndrome (ME/CFS). The author concludes that surgery is not an effective treatment for these conditions. This is important because some patients and providers have explored surgical approaches, but the evidence does not support this as a cure.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Brainstem conundrum: the Chiari I malformation.

Mueller, D·Journal of the American Academy of Nurse Practitioners·2001

Chiari I Malformation is a condition where brain tissue extends into the spinal canal, causing various symptoms. This study reviews cases and explains why patients with this condition are often misdiagnosed with ME/CFS, fibromyalgia, or other illnesses, sometimes delaying proper diagnosis by months or years.

E3 PreliminaryCommentaryPEM not requiredEditorial

[Fatigue].

Reinhart, W H, Fleisch, F·Praxis·2001

Fatigue is a very common symptom that doctors see in many patients. This editorial discusses how doctors should evaluate someone with fatigue by taking a careful history, doing a physical exam, and ordering appropriate tests. When other diseases are ruled out, chronic fatigue syndrome may be diagnosed, though its causes remain unknown. The most proven treatments are graded exercise, cognitive behavioral therapy, and antidepressants if depression or anxiety are present.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Fatigue in primary care.

Morrison, R E, Keating, H J·Obstetrics and gynecology clinics of North America·2001

Fatigue is very common and can have many different causes. Doctors can usually figure out what's causing someone's tiredness through a careful conversation, physical exam, and a few blood tests. In rare cases, people have extreme fatigue lasting 6 months or longer that doesn't have an obvious cause—this may be chronic fatigue syndrome (ME/CFS).

E3 PreliminaryReviewPEM not requiredReview-Narrative

The challenge of evaluating fatigue.

Rodriguez, T·Journal of the American Academy of Nurse Practitioners·2000

This article helps doctors and nurse practitioners understand how to properly evaluate fatigue in patients. It explains that fatigue can have many different causes and can be either short-term or long-term, and it's important to distinguish chronic fatigue from ME/CFS. The article suggests using specific tools and checklists to help identify what might be causing someone's fatigue so it can be properly treated.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Feminist perspectives on the social construction of chronic fatigue syndrome.

Richman, J A, Jason, L A, Taylor, R R et al.·Health care for women international·2000

This study compares how doctors have historically viewed ME/CFS with how patients themselves understand the illness. The researchers found that when medical science couldn't find a viral cause for ME/CFS, doctors increasingly blamed psychiatric or social factors instead of looking for biological explanations. The authors argue that discovering biological markers (measurable signs of disease) could help restore ME/CFS's credibility as a real medical condition, similar to how multiple sclerosis gained recognition.

E3 PreliminaryReviewPEM unclearReview-Narrative

[Chronic fatigue syndrome--old wine in new bottles].

Leonhardt, T·Lakartidningen·2000

This 2000 article examines chronic fatigue syndrome (ME/CFS) and discusses how the condition may be understood through existing medical knowledge rather than as a completely new disease. The author explores what we already know about ME/CFS and how current medical frameworks apply to this complex illness.

E3 PreliminaryReviewPEM unclearReview-Narrative

[Chronic fatigue syndrome--the disease and approaches to treatment].

Apel-Paz, M, Lior, B, Shemesh-Kigli, R·Harefuah·2000

This review article examines ME/CFS, describing what the disease is and discussing different treatment approaches. The authors provide an overview of the condition and explore various ways doctors have tried to help patients manage their symptoms. This type of review helps bring together existing knowledge about the illness and its management.

E3 PreliminaryReviewPEM unclearReview-Narrative

Misunderstood illnesses: fibromyalgia and chronic fatigue syndrome.

Robertson, T J·Alberta RN·1999

This article discusses how fibromyalgia and chronic fatigue syndrome (ME/CFS) are often misunderstood by healthcare providers and the public. The author explains the key characteristics of both conditions and why they are frequently confused with other illnesses or dismissed as not being 'real' diseases. The article aims to help people better understand these complex conditions.

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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.