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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

441–460 of 517 studies

E3 PreliminaryGuidelinePEM not requiredGuideline

[Indications for management in long-term, physically unexplained fatigue symptoms].

van der Meer, J W, Rijken, P M, Bleijenberg, G et al.·Nederlands tijdschrift voor geneeskunde·1997

This guideline, developed by Dutch doctors and health officials, suggests that chronic fatigue lasting more than 6 months without a clear medical cause should be managed differently depending on how long someone has had it. Rather than continuously searching for hidden causes, patients are encouraged to gradually rebuild activity using a structured schedule and focus on overall health promotion.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chronic fatigue syndrome: an update for clinicians in primary care.

Houde, S C, Kampfe-Leacher, R·The Nurse practitioner·1997

This article explains what ME/CFS is and how doctors can recognize it. The main challenge is that ME/CFS doesn't show up on standard tests, so doctors need to rule out other conditions first. Treatment works best when it's tailored to each person's specific symptoms and needs.

InterventionsDiagnostics

E3 PreliminaryCohortPEM unclear

A 56-year-old woman with chronic fatigue syndrome.

Komaroff, A L·JAMA·1997

This case study describes one patient's experience with ME/CFS, detailing her symptoms, medical history, and clinical presentation. The study provides an in-depth look at how ME/CFS affects a real person and what doctors observed during evaluation. This type of detailed patient story can help both patients and doctors better understand the condition.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome].

van der Meer, J W·Nederlands tijdschrift voor geneeskunde·1997

This review examines different theories about what causes ME/CFS, ranging from persistent infections and metabolic problems to psychiatric factors. While many potential causes have been proposed—including lingering infections, toxins, immune system problems, nervous system dysfunction, and hormone imbalances—none have been definitively proven. The authors note that psychological factors play an important role in how the illness develops and can be helpful in treating patients.

E3 PreliminaryCommentaryPEM not requiredEditorial

Chronic fatigue syndrome and occupational health.

Mounstephen, A, Sharpe, M·Occupational medicine (Oxford, England)·1997

This article reviews what doctors who work in occupational health need to know about ME/CFS to help their patients. The authors discuss what ME/CFS is, what might cause it, how patients typically recover, and practical ways to diagnose and manage the condition. They argue that occupational health doctors are in a good position to help improve outcomes for people with ME/CFS, particularly by improving education, rehabilitation programs, and support for staying in or returning to work.

E3 PreliminaryCommentaryPEM unclearEditorial

Chronic fatigue syndrome: a 20th century illness?

Wessely, S·Scandinavian journal of work, environment & health·1997

This article examines how ME/CFS became recognized as a medical illness in modern times. The condition was largely unknown and unnamed until the 1980s, when it emerged under various labels including 'chronic Epstein-Barr virus syndrome' and later 'chronic fatigue syndrome.' The author discusses how different countries use different names for the condition and explores connections between ME/CFS and the concept of somatization—when stress or psychological factors manifest as physical symptoms.

E3 PreliminaryPEM unclear

Meeting the frustrations of chronic fatigue syndrome.

Plioplys, A V, Plioplys, S, Davis, J S·Hospital practice (1995)·1997

This article discusses the challenges that ME/CFS patients face, including long-lasting disability and doctors who may not understand or believe in the condition. The authors explain that while there are no blood tests that definitively prove ME/CFS, doctors can confidently diagnose it using established criteria and ruling out other diseases. They suggest that medications can help manage symptoms while patients work toward recovery.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Definition of "chronic fatigue syndrome" (CFS)].

Heyll, U, Wachauf, P, Senger, V et al.·Medizinische Klinik (Munich, Germany : 1983)·1997

In 1988, doctors created an official definition for chronic fatigue syndrome (CFS) to help researchers study it consistently. However, this study found that the original definition didn't work as well as hoped—it didn't capture the condition accurately, and patients with CFS turned out to be quite different from each other. The authors suggest that CFS should be understood as a descriptive condition rather than a single disease with one cause.

E3 PreliminaryCohortPEM not requiredCase-Control

[Chronic fatigue--'tired with 23 i's'].

van der Meer, J W, Elving, L D·Nederlands tijdschrift voor geneeskunde·1997

This study describes two patients with severe tiredness. One woman had chronic fatigue syndrome and improved slowly over time, while one man's exhaustion was caused by a treatable pituitary gland tumor that was removed surgically. The doctors emphasize that it's important to thoroughly examine patients to find out if something else is causing their tiredness before diagnosing chronic fatigue syndrome.

E3 PreliminaryGuidelinePEM not requiredGuideline

Chronic fatigue syndrome. A practical guide to assessment and management.

Sharpe, M, Chalder, T, Palmer, I et al.·General hospital psychiatry·1997

This guide explains how doctors should assess and manage ME/CFS by building trust with patients, taking a detailed history, and ruling out other conditions. Treatment focuses on helping patients understand their illness, establish consistent activity and sleep patterns, and gradually return to normal activities, with cognitive behavioral therapy being the only proven effective approach. The authors emphasize that ME/CFS is a real, treatable condition and provide practical strategies to help patients avoid misinterpreting their symptoms or fearing activity.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Chronic fatigue syndrome. Definition, diagnostic measures and therapeutic possibilities].

Lieb, K, Dammann, G, Berger, M et al.·Der Nervenarzt·1996

ME/CFS is a disorder that causes persistent tiredness, but doctors cannot diagnose it with a simple blood test or scan. Instead, doctors use specific clinical criteria to identify the condition, while carefully ruling out other illnesses like depression or sleep problems that can look similar. Currently, there is no cure for ME/CFS, so treatment focuses on managing individual symptoms like poor sleep, pain, and mood changes with a combination of medical care and psychological support.

Pain and SensitizationSleepDiagnostics

E3 PreliminaryReviewPEM not requiredReview-Narrative

The history and treatment of chronic fatigue syndrome.

Ross, E·Nursing times·1996

This article reviews the history of chronic fatigue syndrome (ME/CFS) and how it has been treated over time. ME/CFS is a real illness that affects 1 to 2.5 out of every 100 people. The article explains what doctors look for when diagnosing ME/CFS and describes the important role nurses play in helping patients manage and treat their condition.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[Endocrinopathy in the differential diagnosis of chronic fatigue syndrome].

Sterzl, I, Zamrazil, V·Vnitrni lekarstvi·1996

This review discusses how disorders of the endocrine system (hormone-producing glands) can cause fatigue and other symptoms that overlap with ME/CFS, making them difficult to distinguish. The authors highlight that some patients initially thought to have ME/CFS actually have treatable hormone conditions, particularly autoimmune thyroid disease or other glandular disorders. They also explore how problems with the stress-hormone system (the hypothalamus-pituitary-adrenal axis) might play a role in both endocrine disease and ME/CFS.

E3 PreliminaryBehavioralPEM not requiredCase-Control

Chronic fatigue syndrome and dieting disorders: diagnosis and management problems.

Griffiths, R A, Beumont, P J, Moore, G M et al.·The Australian and New Zealand journal of psychiatry·1996

This study looked at three patients who were diagnosed with ME/CFS but also had eating disorders (anorexia nervosa or bulimia nervosa). The doctors found that proper screening for eating disorders is important because patients and families may focus on the ME/CFS diagnosis and miss the eating disorder, which delays appropriate treatment. Early identification of both conditions together can help reduce serious health problems.

E3 PreliminaryCohortPEM unclear

[A case from practice (343). Chronic fatigue syndrome following Lyme borreliosis].

Diamantis, I·Praxis·1996

This case study describes a patient who developed chronic fatigue syndrome (ME/CFS) following a Lyme borreliosis infection (transmitted by tick bite). The report documents one person's experience, showing how a tick-borne infection may have triggered or contributed to the development of ME/CFS symptoms.

E3 PreliminaryGuidelinePEM not requiredGuideline

Chronic fatigue syndrome. Summary of a report of a joint committee of the Royal Colleges of Physicians, Psychiatrists and General Practitioners.

Wessely, S·Journal of the Royal College of Physicians of London·1996

This report from major medical colleges explains that ME/CFS is not caused by a single problem, but rather results from many different factors working together. The condition develops differently in different people, depending on what triggered it initially, what made them vulnerable to it, and what keeps it going. Understanding all these different pieces is important for helping patients recover.

E3 PreliminaryReviewPEM unclearReview-Narrative

Chronic fatigue syndrome.

Sharpe, M·The Psychiatric clinics of North America·1996

ME/CFS is a serious illness that causes extreme tiredness, difficulty concentrating, muscle pain, and other physical symptoms that doctors cannot fully explain with standard tests. This review explains that ME/CFS involves both real physical changes in the body and emotional or social factors that affect how someone experiences the illness. The best approach to treating ME/CFS is to carefully assess each person's unique situation rather than debating whether it's purely medical or psychiatric.

E3 PreliminaryGuidelinePEM unclearGuideline

The chronic fatigue syndrome: a position paper.

Salit, I E·The Journal of rheumatology·1996

This is a position paper from a medical expert on chronic fatigue syndrome (ME/CFS) published in a rheumatology journal in 1996. Rather than presenting new research data, the author provides professional guidance and recommendations on how to understand and approach ME/CFS as a medical condition. This type of paper helps establish clinical standards and best practices for doctors treating patients with ME/CFS.

E3 PreliminaryReviewPEM unclearReview-Narrative

[Clinical aspects and neurologic expert assessment in sequelae of whiplash injury to the cervical spine].

Jenzer, G·Der Nervenarzt·1995

This review examined whiplash injuries to the neck and the long-term complications some patients develop, called chronic whiplash syndrome. The authors found that whiplash injuries can cause a complex mix of symptoms similar to those seen in chronic fatigue syndrome and fibromyalgia, making diagnosis challenging. Most people recover well from whiplash, though some experience prolonged difficulties.

E3 PreliminaryGuidelinePEM not requiredGuideline

Chronic fatigue syndrome: current perspectives on evaluation and management.

Hickie, I B, Lloyd, A R, Wakefield, D·The Medical journal of Australia·1995

This guideline helps doctors evaluate and treat ME/CFS by reviewing what we know about the condition. The authors found that while many medical and psychological factors can affect recovery, no single infection has been proven to cause ME/CFS. Treatment works best when doctors address all aspects of a patient's health—physical, mental, and social—rather than focusing on just one area.

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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.