Search and filter 6,188 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 →
5821–5840 of 6,188 studies
Plioplys, A V·Neurology·1997
Researchers investigated whether people with ME/CFS have antibodies (immune proteins) in their blood that attack muscles or the brain, which could explain fatigue and brain fog symptoms. They compared 10 ME/CFS patients with 10 healthy controls but did not find evidence of these harmful antibodies in either group.
Galbraith, D N, Nairn, C, Clements, G B·The Journal of general virology·1997
Researchers tested blood samples from 8 people with ME/CFS and found traces of enterovirus (a type of virus) in samples taken at least 5 months apart. In 4 of these individuals, the virus appeared to be the same virus persisting in their body over time, rather than a new infection. This suggests that some people with ME/CFS may have viruses that linger in their system rather than being cleared completely.
Clements, A, Sharpe, M, Simkin, S et al.·Journal of psychosomatic research·1997
This study interviewed 66 people with ME/CFS to understand what they believe causes their illness and how they think they can manage it. Most patients believed their illness was primarily physical, though over half also thought stress played a role. Patients felt they could control symptoms by reducing activity, but believed they could not influence the underlying disease itself.
Demitrack, M A·Journal of psychiatric research·1997
This review examines how ME/CFS might be connected to problems with the body's stress hormone system and brain chemistry. Researchers found that people with ME/CFS often have a specific pattern of disruption in their stress response system—different from what occurs in depression—along with changes in serotonin levels. These findings suggest that ME/CFS involves real biological changes, not just psychological factors.
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.
Cannon, J G, St Pierre, B A·Journal of psychiatric research·1997
This review looks at why the immune system works differently in women compared to men. Women generally have stronger immune responses, which helps them fight infections better, but also makes them more likely to develop autoimmune diseases where the immune system attacks the body. Because ME/CFS affects mostly women, researchers wondered if these gender differences in immune function might help explain why the illness is so much more common in women.
Redmond, G·International journal of fertility and women's medicine·1997
This paper discusses why women often experience mood changes and fatigue, and how doctors can help. The authors suggest that these symptoms are often related to depression rather than hormonal problems alone, and that SSRIs (a common type of antidepressant) can be helpful for many women. They also emphasize the importance of listening to patients about stress and life challenges.
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.
Ziem, G, McTamney, J·Environmental health perspectives·1997
This study looked at people who react strongly to everyday chemicals—like cleaning products, pesticides, and new materials—at levels that don't bother most people. Researchers gave these patients questionnaires and ran medical tests to understand their symptoms. They found that chemical sensitivity often overlaps with ME/CFS and fibromyalgia, and that several body systems (liver, nervous system, immune system) appear to be affected in these patients.
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.
Jason, L A, Tryon, W W, Frankenberry, E et al.·Psychological reports·1997
This study looked at whether questionnaires people fill out about their fatigue match what activity monitors show about how much they actually move. Researchers tracked one patient with ME/CFS using both self-report scales and an actigraphy device. They found that activity levels were connected to things that predict fatigue, but were not directly related to how fatigued the person felt.
Allain, T J, Bearn, J A, Coskeran, P et al.·Biological psychiatry·1997
This study looked at hormone levels in people with ME/CFS compared to healthy controls. Researchers found that ME/CFS patients had lower levels of two growth-related hormones (IGF-I and IGF-II), a weaker response to a hormone stimulation test, higher insulin levels, and lower levels of a protein that regulates these hormones. These differences suggest the hormone system that controls growth and metabolism may work differently in ME/CFS.
Dickinson, C J·European journal of clinical investigation·1997
This review examines why ME/CFS develops, looking at evidence from 40 years of research. The author discusses how ME/CFS may involve damage to the brain stem (the oldest part of the brain that controls basic functions like sleep and alertness), possibly from a previous viral infection. Brain imaging studies have found small patches of damage in the brain stems of some ME/CFS patients, similar to what is seen in other conditions like post-polio fatigue.
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.
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.
Gupta, S, Aggarwal, S, See, D et al.·Journal of psychiatric research·1997
Researchers tested immune cells from people with ME/CFS to measure inflammation-related proteins called cytokines. They found that certain immune cells from ME/CFS patients produced higher levels of inflammatory proteins (TNF-alpha and IL-6) without any stimulation, but produced lower levels of a protective protein (IL-10) compared to healthy people. These imbalances might explain some of the symptoms people with ME/CFS experience.
Holland, P·The Journal of analytical psychology·1997
This study describes how one woman with ME/CFS improved over three years of talk therapy that focused on her emotions and relationships. The therapy helped her recognize patterns from her past—particularly how she swung between wanting closeness and withdrawing into isolation—which seemed connected to her physical exhaustion. As she worked through these patterns and built better relationships, including becoming pregnant, her fatigue improved.
Dinan, T G, Majeed, T, Lavelle, E et al.·Psychoneuroendocrinology·1997
This study tested whether a specific brain chemical system called serotonin works properly in ME/CFS patients. Researchers gave patients and healthy people a medication that activates serotonin receptors, then measured how the body's stress-response system (the HPA axis) reacted. They found that ME/CFS patients had a weaker response than healthy people, suggesting this brain system doesn't function normally in ME/CFS.
Suhadolnik, R J, Peterson, D L, O'Brien, K et al.·Journal of interferon & cytokine research : the official journal of the International Society for Interferon and Cytokine Research·1997
This study examined a specific immune system protein called RNase L in people with ME/CFS. Researchers found that people with ME/CFS had unusual forms of this protein that were different sizes and worked differently than those in healthy people, suggesting their antiviral defense system may be malfunctioning in a previously unknown way.
Goldenberg, D L·Current opinion in rheumatology·1997
This review examines three related conditions—fibromyalgia, ME/CFS, and myofascial pain syndrome—and discusses ongoing challenges in diagnosing and treating them. The study found that psychiatric conditions are not a core feature of these diseases, but rather reflect that people with these conditions are more likely to seek medical help. The researchers identified that a blood pressure problem called neurally mediated hypotension may play a role in ME/CFS, and that treating patients in multidisciplinary groups (rather than in isolation) showed more promise than traditional individual treatments.
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Thematic groupings by clinical question or research area.
PET imaging and other studies providing evidence for brain inflammation in ME/CFS.
NeurologyMetabolomics and mitochondrial function studies revealing energy metabolism disruption.
MetabolismStudies identifying potential biological markers for ME/CFS diagnosis and stratification.
Biomarker