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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

341–360 of 510 studies

E3 PreliminaryReviewPEM unclearReview-Narrative

[Distinguishing between depression and chronic fatigue syndrome].

Asberg, Marie, Nygren, Ake, Nager, Anna·Lakartidningen·2013

This study examines how depression and ME/CFS are different conditions, even though they can look similar on the surface. The researchers discuss why it's important for doctors to tell these conditions apart, since they require different treatment approaches. Understanding these differences helps ensure patients get the right care for their specific condition.

E3 PreliminaryPEM not requiredRegistry-Resource

A pilot registry of unexplained fatiguing illnesses and chronic fatigue syndrome.

Brimmer, Dana J, Maloney, Elizabeth, Devlin, Rebecca et al.·BMC research notes·2013

This study tested whether doctors and patient groups could help identify people with ME/CFS for a patient registry (a database of medical information). Researchers in Georgia contacted healthcare providers and a local ME/CFS support group to refer patients for evaluation. Of 104 people who completed clinic visits, 36% had ME/CFS, 17% had fatigue that didn't quite meet ME/CFS criteria, and 47% had other medical or psychiatric conditions instead. This shows that many people with fatigue symptoms may have treatable conditions other than ME/CFS.

E3 PreliminaryReviewPEM unclearReview-Narrative

[Fatigue syndromes--an overview of terminology, definitions and classificatory concepts].

Dörr, Johanna, Nater, Urs·Psychotherapie, Psychosomatik, medizinische Psychologie·2013

This article reviews how doctors classify and differentiate between different fatigue conditions, including ME/CFS, burnout, and an older condition called neurasthenia. The authors found that while these conditions share some symptoms, they have important differences—but there currently isn't enough research to clearly separate them. Depression often occurs alongside ME/CFS and burnout, making diagnosis more complicated.

E3 PreliminaryDiagnosticPEM unclearMethods-Paper

Method Issues in Epidemiological Studies of Medically Unexplained Symptom-based Conditions in Veterans.

Coughlin, Steven S, McNeil, Rebecca B, Provenzale, Dawn T et al.·Journal of military and veterans' health·2013

This study examined how researchers diagnose ME/CFS and related conditions in veterans, particularly those who served in the 1990-1991 Gulf War. The researchers found that many veterans had other medical conditions that could complicate or mask ME/CFS diagnosis. The study highlights that how doctors define and diagnose these conditions matters a lot, and different approaches can lead to very different results.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chronic fatigue syndrome in the UK armed forces.

Le Blackadder-Coward, J C Q, Perry, S·Journal of the Royal Naval Medical Service·2013

This study examined how ME/CFS (also called CFS) affects people serving in the UK military, and how the condition should be recognized and managed in this specific setting. ME/CFS can significantly impact a service member's career and ability to work in challenging military environments. The article discusses how doctors can better identify and treat this condition in military personnel.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Chronic Lyme; diagnostic and therapeutic challenges.

Ljøstad, U, Mygland, Å·Acta neurologica Scandinavica. Supplementum·2013

This review discusses chronic Lyme disease, a rare condition caused by ongoing infection with the bacteria that causes Lyme disease. The main symptoms include progressive brain and spinal cord inflammation, skin changes, nerve damage, and joint pain. The authors explain how doctors can diagnose chronic Lyme using specific blood tests and cerebrospinal fluid tests, and recommend standard antibiotic treatment rather than experimental or prolonged approaches.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

Developing resources to support the diagnosis and management of Chronic Fatigue Syndrome/Myalgic Encephalitis (CFS/ME) in primary care: a qualitative study.

Hannon, Kerin, Peters, Sarah, Fisher, Louise et al.·BMC family practice·2012

This study asked patients, carers, and doctors in North West England what would help them better diagnose and manage ME/CFS in general practice. The researchers found that patients want to be believed and taken seriously, while doctors said they need better training and support. Based on everyone's feedback, the team created practical tools including a DVD for patients, information leaflets, and online training for doctors.

E3 PreliminaryGuidelinePEM not requiredGuideline

[Persistent fatigue following Q fever].

Keijmel, Stephan P, Morroy, Gabriëlla, Delsing, Corine E et al.·Nederlands tijdschrift voor geneeskunde·2012

After a bacterial infection called Q fever, about 1 in 5 patients develop long-lasting fatigue and other symptoms called Q fever fatigue syndrome (QFS). This guideline from the Netherlands helps doctors diagnose and treat QFS consistently. Many patients recover on their own within six months, but those who don't may benefit from cognitive behavioral therapy, a type of talk therapy that helps people manage chronic fatigue.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

Minimum data elements for research reports on CFS.

Jason, Leonard A, Unger, Elizabeth R, Dimitrakoff, Jordan D et al.·Brain, behavior, and immunity·2012

Researchers noticed that different ME/CFS studies were collecting and reporting information in very different ways, making it hard to compare results across laboratories. This paper outlines the essential information that all ME/CFS research studies should include—like how patients were selected, what their characteristics are, and how they were tested—so that future studies can be compared fairly and findings can be better understood.

E3 PreliminaryReviewPEM unclearReview-Narrative

Chronic fatigue syndrome or myalgic encephalomyelitis.

Burns, Dianne·Nursing standard (Royal College of Nursing (Great Britain) : 1987)·2012

ME/CFS is a serious illness that affects many body systems, especially the nervous and immune systems, and can impact anyone regardless of age, race, or background. This guideline article helps nurses and healthcare workers recognize and support ME/CFS patients by providing practical knowledge and management strategies. The recommendations can be used by healthcare professionals in different settings to better care for people living with this condition.

E3 PreliminaryDiagnosticPEM unclearCross-Sectional

Fatigue Scales and Chronic Fatigue Syndrome: Issues of Sensitivity and Specificity.

Jason, Leonard A, Evans, Meredyth, Brown, Molly et al.·Disability studies quarterly·2011

This study tested different questionnaires and scales designed to measure fatigue in ME/CFS patients to see how well they could identify people with the disease. Researchers found that most common fatigue measurement tools didn't work very well—some were good at spotting sick people but missed others, or vice versa. The most promising tool was a specific question about fatigue that gets worse after physical activity, which is a key feature of ME/CFS.

E3 PreliminaryCohortPEM not requiredCase-Control

Sympathetic neural hyperalgesia edema syndrome, a frequent cause of pelvic pain in women, mistaken for Lyme disease with chronic fatigue.

Check, J H, Cohen, R·Clinical and experimental obstetrics & gynecology·2011

This study describes a woman who was diagnosed with Lyme disease and treated with antibiotics for chronic fatigue, but her symptoms didn't improve. Doctors then tested her ability to excrete water from her body and found it was impaired, suggesting a problem with her sympathetic nervous system (the part that controls automatic body functions). When she was treated with a stimulant medication instead, she improved significantly.

E3 PreliminaryCohortPEM not required

Decades of delayed diagnosis in 4 levodopa-responsive young-onset monogenetic parkinsonism patients.

Ling, Helen, Braschinsky, Mark, Taba, Pille et al.·Movement disorders : official journal of the Movement Disorder Society·2011

This study describes four young patients who were initially misdiagnosed with psychological movement disorders or chronic fatigue syndrome, but actually had a genetic form of Parkinson's disease. Their misdiagnosis lasted 10 to 23 years before the correct diagnosis was made. Once they received the correct treatment with levodopa medication, they all improved significantly, showing that the right diagnosis and treatment can make a major difference.

E3 PreliminaryCommentaryPEM unclearEditorial

Diagnosis and management of fibromyalgia: how and why.

Hayhoe, Simon·Pain management·2011

Fibromyalgia is a condition causing widespread muscle pain, tiredness, and sleep problems that doctors still debate about. It shares some features with ME/CFS and may involve both physical changes in how the nervous system processes pain and psychological factors. Treatment typically includes certain antidepressants, anti-seizure medications, and talking therapy with gentle exercise, though most patients only get partial improvement.

E3 PreliminaryCohortPEM unclearCross-Sectional

Patients' hopes and expectations of a specialist chronic fatigue syndrome/ME service: a qualitative study.

McDermott, C, Lynch, J, Leydon, G M·Family practice·2011

This study asked 20 newly referred ME/CFS patients what they hoped to gain from visiting a specialist service. Patients most wanted a clear diagnosis, better understanding of their illness, practical guidance on managing it, and hope for the future. Most patients felt uncertain about ME/CFS and wanted more information earlier in their illness journey, rather than waiting to see a specialist.

E3 PreliminaryReviewPEM not requiredReview-Narrative

Fatigue and chronic fatigue in the elderly: definitions, diagnoses, and treatments.

Morelli, Vincent·Clinics in geriatric medicine·2011

This review article helps doctors understand fatigue in older adults by explaining three types: fatigue that comes on recently, fatigue that lasts a long time, and chronic fatigue syndrome. The article discusses how doctors can evaluate fatigue and offers both medication and non-medication treatments like exercise, vitamins, diet changes, and behavioral strategies.

E3 PreliminaryReviewPEM not requiredReview-Narrative

[The chronic asthenia syndrome: a clinical approach].

Young, Pablo, Finn, Bárbara C, Bruetman, Julio et al.·Medicina·2010

Fatigue is one of the most common reasons people visit doctors, affecting about 30% of patients. This article explains how doctors should think about different types of fatigue—including chronic fatigue syndrome (ME/CFS), which affects 0.2–0.7% of people. The authors emphasize that finding and treating the underlying cause is the best approach, though about 20% of patients never get a clear diagnosis.

E3 PreliminaryCohortPEM unclearCross-Sectional

A discourse analytic study of ME/CFS (Chronic Fatigue Syndrome) sufferers' experiences of interactions with doctors.

Guise, Jennie, McVittie, Chris, McKinlay, Andy·Journal of health psychology·2010

This study looked at how ME/CFS patients describe their experiences when talking to doctors. Researchers analyzed conversations from an online support group and found that patients often feel their doctors don't listen to them or take their condition seriously. Interestingly, patients were careful about how they complained, trying to focus on practical issues rather than seeming like they were just complaining.

E3 PreliminaryCohortPEM not requiredObservational

Making the diagnosis of Chronic Fatigue Syndrome/Myalgic Encephalitis in primary care: a qualitative study.

Chew-Graham, Carolyn, Dowrick, Christopher, Wearden, Alison et al.·BMC family practice·2010

This study asked 22 general practitioners (GPs) about their experiences diagnosing ME/CFS in their clinics. GPs said they find it hard to understand what ME/CFS is, and they typically focus on ruling out other diseases rather than confidently saying a patient has ME/CFS. Many GPs worried that giving someone an ME/CFS diagnosis might actually harm them, and they weren't sure what to do to help these patients once diagnosed.

E3 PreliminaryDiagnosticPEM not requiredMethods-Paper

The Hebrew version of the FibroFatigue scale: validation of a questionnaire for assessment of fibromyalgia and chronic fatigue syndrome.

Ablin, Jacob N, Odes, Lisa, Neumann, Lily et al.·Rheumatology international·2010

This study tested whether a Hebrew-language questionnaire called the FibroFatigue Scale (FFS) accurately measures symptoms in fibromyalgia patients. Researchers gave 100 patients with fibromyalgia this questionnaire along with other standard symptom-measuring tools, and found that the FFS reliably detected and measured how severe their symptoms were.

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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.