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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 6,171 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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1198 studies

E0 — Consensus644E1 — Replicated320E2 — Moderate2,785E3 — Preliminary2,422

ME/CFS4,028Long COVID217Post-infectious189Overlapping1,051

Required for diagnosis415Not specified / unclear2,222Not required3,534

Post-Exertional Malaise1,067Cognitive Dysfunction1,737Pain1,621Unrefreshing Sleep800Orthostatic Intolerance479

Cytokines819Gene Expression568Metabolomics475Neuroimaging468Autoantibodies458

Infection-Triggered1,175Long COVID Overlap589Pediatric494Severe231

Strong Phenotyping439Sex-Stratified327Severe ME Included118

Systematic Review266Meta-Analysis60RCT300

Peer-reviewed6,114Preprint3Unclear54

1141–1160 of 1,198 studies

E3 PreliminaryMechanismPEM not requiredMechanistic

MELISA-an in vitro tool for the study of metal allergy.

Stejskal, V D, Cederbrant, K, Lindvall, A et al.·Toxicology in vitro : an international journal published in association with BIBRA·1994

This study tested whether certain metals used in dental work and medical devices can trigger immune system reactions in people with chronic fatigue and mouth problems. Researchers used a laboratory test called MELISA to measure how immune cells from patients responded to metals like mercury, gold, and palladium. They found that people with symptoms had stronger immune reactions to these metals than healthy people without symptoms, suggesting a possible connection between metal exposure and their health problems.

E3 PreliminaryReviewPEM unclearReview-Narrative

Neurobiological aspects of the chronic fatigue syndrome.

Bearn, J, Wessely, S·European journal of clinical investigation·1994

This study looked at how the brain and nervous system may be involved in chronic fatigue syndrome (ME/CFS). Researchers examined the biological mechanisms that might explain why people with ME/CFS experience persistent tiredness and other symptoms. The review helps identify which parts of the nervous system could be affected in this condition.

E3 PreliminaryReviewPEM unclearReview-Narrative

Viral studies of chronic fatigue syndrome.

Ablashi, D V·Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·1994

This review article examines whether viruses play a role in causing ME/CFS by looking at existing research on viral infections in patients with this condition. The author analyzes studies investigating connections between various viruses and ME/CFS symptoms. The review helps summarize what scientists knew in 1994 about potential viral causes of the illness.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chronic fatigue syndrome: a diagnostic challenge for the laboratory.

Lanham, R J·Clinical laboratory science : journal of the American Society for Medical Technology·1994

This review examined what we know about ME/CFS, a condition characterized by extreme tiredness, pain, and thinking difficulties that come and go in cycles. While researchers don't yet know what causes ME/CFS, studies show that people with this condition often have unusual immune system test results. Currently, there is no single blood test or marker that can definitively diagnose ME/CFS, so doctors treat symptoms based on what each patient experiences.

Immune SystemPost-Exertional Malaise

E3 PreliminaryCohortPEM not requiredObservational

Human adjuvant disease revisited: a review of eleven post-augmentation mammoplasty patients.

Fenske, T K, Davis, P, Aaron, S L·Clinical and experimental rheumatology·1994

This study examined 11 women who developed widespread pain, fatigue, and joint symptoms after receiving silicone breast implants. The researchers found that 6 patients met criteria for fibromyalgia and 5 had chronic fatigue syndrome symptoms, but none had evidence of a traditional autoimmune disease. The authors suggest these cases should be classified as CFS or fibromyalgia rather than a unique implant-related disease.

Immune SystemPost-Exertional Malaise

E3 PreliminaryPEM not required

Cytomegalovirus-related sequence in an atypical cytopathic virus repeatedly isolated from a patient with chronic fatigue syndrome.

Martin, W J, Zeng, L C, Ahmed, K et al.·The American journal of pathology·1994

Researchers found an unusual virus in a patient with chronic fatigue syndrome that looked similar to cytomegalovirus (CMV) under a microscope but behaved differently. The virus had genetic material that partially matched CMV, but it didn't react to standard tests for known viruses. This suggests it may be a previously unknown type of virus that can establish a long-term infection in humans.

E3 PreliminaryReviewPEM unclearReview-Narrative

[The chronic fatigue syndrome].

Artsimovich, N G, Chugunov, V S, Kornev, A V et al.·Zhurnal nevrologii i psikhiatrii imeni S.S. Korsakova·1994

ME/CFS is a serious condition that causes extreme tiredness, brain fog, and flu-like symptoms that can last for months or years. The condition affects people of all ages, but is most common in women under 45. Researchers believe the immune system is not working properly in people with ME/CFS, though the exact problem is still unclear.

E3 PreliminaryCommentaryPEM not requiredEditorial

Chronic fatigue syndrome update. Findings now point to CNS involvement.

Bell, D S·Postgraduate medicine·1994

This review examines what causes ME/CFS and finds that common viruses like Epstein-Barr virus are likely not responsible. Instead, the evidence points to problems in the central nervous system—the brain and spinal cord—as a key factor in ME/CFS. Researchers found multiple abnormalities related to how the brain regulates hormones, processes chemicals, and controls blood flow, which may explain why patients experience fatigue and other symptoms.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[A new virus: the human herpesvirus 6].

Agut, H, Aubin, J T·La Revue du praticien·1994

Human herpesvirus 6 (HHV-6) is a virus discovered in 1986 that infects most people during childhood and stays in the body for life. It normally causes fever and rash in infants, but researchers have wondered whether it might play a role in chronic fatigue syndrome and other conditions, though this connection remains unclear. Some antiviral medications like ganciclovir appear to work against HHV-6 in laboratory tests.

E3 PreliminaryMechanismPEM not requiredObservational

Cytokine production and fatigue in patients with chronic fatigue syndrome and healthy control subjects in response to exercise.

Lloyd, A, Gandevia, S, Brockman, A et al.·Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·1994

Researchers asked whether a specific immune response causes the fatigue that ME/CFS patients experience after exercise. They had patients and healthy people do a 30-minute hand-grip exercise and checked their blood for immune chemicals (cytokines) before, during, and after exercise. Surprisingly, they found no changes in these immune chemicals in either group, and patients actually reported feeling less fatigued after the exercise—the opposite of what happens in real life.

Immune SystemPost-Exertional Malaise

E3 PreliminaryCommentaryPEM not requiredEditorial

Eicosanoids and essential fatty acid modulation in chronic disease and the chronic fatigue syndrome.

Gray, J B, Martinovic, A M·Medical hypotheses·1994

This study proposes that ME/CFS may involve problems with how the body processes essential fatty acids—nutrients found in foods like fish and seeds. When stress is constant or too intense, the body's ability to use these fatty acids becomes sluggish, which can trigger ongoing immune system problems and exhaustion. The researchers suggest that changing your diet to better balance these fatty acids might help restore normal immune function and improve symptoms.

Energy MetabolismImmune System

E3 PreliminaryReviewPEM not requiredReview-Narrative

Viral studies of chronic fatigue syndrome.

Levy, J A·Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·1994

This review explores whether viruses might cause ME/CFS. Researchers found that while many different viruses have been suspected, no single virus has been proven to be the cause. However, studies show that people with ME/CFS have immune system abnormalities—particularly problems with cells that fight infection—suggesting their body may be stuck in an overactive response to a virus they once had or still have.

E3 PreliminaryMechanismPEM not requiredCross-Sectional

Dysregulated expression of tumor necrosis factor in chronic fatigue syndrome: interrelations with cellular sources and patterns of soluble immune mediator expression.

Patarca, R, Klimas, N G, Lugtendorf, S et al.·Clinical infectious diseases : an official publication of the Infectious Diseases Society of America·1994

This study tested blood samples from 70 ME/CFS patients and compared them to healthy people. Researchers found that about 60% of ME/CFS patients had unusually high levels of immune chemicals called cytokines, particularly two types called TNF-alpha and TNF-beta. These chemicals are normally released by the body to fight infections, but in ME/CFS patients they appeared to be abnormally activated even without an active infection.

E3 PreliminaryMechanismPEM not requiredMechanistic

Infection of natural killer cells by human herpesvirus 6.

Lusso, P, Malnati, M S, Garzino-Demo, A et al.·Nature·1993

This study found that a virus called HHV-6 can directly infect and damage natural killer cells, which are important immune cells that normally fight viruses. When HHV-6 infects these cells, it kills them and also causes them to express a protein that makes them vulnerable to HIV infection. This suggests that HHV-6 might be a way the body's natural antiviral defenses get weakened.

E3 PreliminaryReviewPEM unclearReview-Narrative

The role of viral infection in polymyositis, dermatomyositis and chronic fatigue syndrome.

Behan, W M, Behan, P O·Bailliere's clinical neurology·1993

This review examines whether viral infections might be responsible for causing three conditions: polymyositis, dermatomyositis, and ME/CFS. The authors looked at evidence connecting viruses to these diseases, which cause muscle weakness and persistent fatigue. Understanding these potential links could help explain why some people develop ME/CFS after infections.

E3 PreliminaryReviewPEM unclearReview-Narrative

Is chronic fatigue syndrome an infectious disease?

Mawle, A C, Reyes, M, Schmid, D S·Infectious agents and disease·1993

This 1993 paper examines whether chronic fatigue syndrome (ME/CFS) might be caused by an infection. The authors reviewed evidence about infectious agents and their possible role in ME/CFS development. While the study explores this connection, it does not provide definitive answers about whether an infection causes the illness.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Is juvenile diabetes a viral disease?

Fohlman, J, Friman, G·Annals of medicine·1993

This review examines whether viruses—particularly enteroviruses like Coxsackie and ECHO viruses—might trigger type 1 diabetes in children. The authors suggest that a person can catch one of these viruses, and even though the initial infection may go unnoticed, the virus can persist in the body and potentially trigger the immune system to attack the insulin-producing cells in the pancreas. Interestingly, the authors mention that similar persistent viral infections might also play a role in chronic fatigue syndrome.

E3 PreliminaryCohortPEM unclearCase-Control

[The "anti-Ki" syndrome: major clinical features].

Matsunaga, K·Rinsho byori. The Japanese journal of clinical pathology·1993

Researchers found that four patients with autoimmune diseases had high levels of anti-Ki antibodies, a type of immune marker. These patients shared several symptoms including hair loss, severe fatigue, muscle weakness, joint inflammation, dry mouth, and blood sugar problems. The study suggests that this antibody pattern may be related to conditions like chronic fatigue syndrome and fibromyalgia.

E3 PreliminaryReviewPEM unclearReview-Narrative

Fibromyalgia, sleep disorder and chronic fatigue syndrome.

Moldofsky, H·Ciba Foundation symposium·1993

This study examined how sleep problems, tiredness, and muscle pain are connected in ME/CFS and fibromyalgia. Both conditions share similar unusual brain wave patterns during sleep that make sleep feel unrefreshing even though people sleep. The research suggests that problems with the immune system and sleep-wake cycle are linked, and interfering with either one can trigger the other and cause ME/CFS symptoms.

E3 PreliminaryReviewPEM unclearReview-Narrative

Low NK syndrome and its relationship to chronic fatigue syndrome.

Aoki, T, Miyakoshi, H, Usuda, Y et al.·Clinical immunology and immunopathology·1993

This study examined whether people with chronic fatigue syndrome (ME/CFS) have lower numbers or reduced function of natural killer (NK) cells, which are part of the immune system that helps fight infections and abnormal cells. The researchers found that some ME/CFS patients showed low NK cell levels or activity, suggesting the immune system may not be working normally in this condition. This finding could help explain why people with ME/CFS experience persistent exhaustion and infections.

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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.