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 →
2221–2240 of 2,422 studies
Stern, K·CDS review·1993
This review article examines the signs and symptoms that people with chronic fatigue syndrome (ME/CFS) commonly experience. The study helps identify what doctors should look for when evaluating patients who may have this condition. Understanding these key features is important for recognizing ME/CFS and distinguishing it from other illnesses.
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.
Ware, N C·Ciba Foundation symposium·1993
This study interviewed 50 people with chronic fatigue to understand how their daily lives, families, and work environments shaped their experience of illness. The researchers found that people often traced their illness to stressful life events and busy lifestyles, and that having ME/CFS sometimes led them to make positive changes by slowing down. The study also explains why ME/CFS patients often feel dismissed—society tends to separate 'mind' from 'body,' making psychological factors seem less real than physical ones.
McSherry, J·Canadian family physician Medecin de famille canadien·1993
This editorial discusses chronic fatigue syndrome (ME/CFS) as a real medical condition affecting about 3 in 100,000 people. Most patients experience symptoms for approximately 2.5 years before recovering to normal health. Since there is no single definitive test, doctors diagnose ME/CFS by ruling out other diseases, and currently no one treatment works for everyone.
Kent-Braun, J A, Sharma, K R, Weiner, M W et al.·Neurology·1993
Researchers tested whether muscle fatigue in ME/CFS patients was caused by problems within the muscle itself or in the brain's ability to control muscles. They found that the muscles worked normally and used energy normally during exercise, but the patients' brains were unable to fully activate their muscles during hard, sustained work. This suggests the primary problem may be in how the nervous system controls muscles rather than in the muscles themselves.
Komaroff, A L·Ciba Foundation symposium·1993
ME/CFS is a long-lasting illness that causes severe tiredness lasting at least six months, along with other symptoms like fever, sore throat, joint pain, and worsening after physical activity. While some symptoms can look like mental health conditions, ME/CFS has physical features—like sudden onset following a flu-like illness and post-exertional exhaustion—that suggest it involves real biological problems. This condition significantly impacts people's ability to work, study, and care for themselves.
Jason, L A·The journal of primary prevention·1993
This 1993 paper explores how the mind, nervous system, and immune system are connected in ME/CFS, and how community support might help with recovery. The authors use a real patient's story to show how understanding these connections and building supportive relationships could be helpful for people struggling with this illness.
Chester, A C·Integrative physiological and behavioral science : the official journal of the Pavlovian Society·1993
This paper proposes a new theory: that extreme fatigue in ME/CFS and related conditions might be the body's protective reflex triggered by nasal or sinus problems. The idea is that in our evolutionary past, when a good sense of smell was crucial for survival, fatigue would have kept sick animals resting safely at home while their nose healed. The author suggests this ancient reflex may still be active in humans today.
Shorter, E·Ciba Foundation symposium·1993
This historical review examines how chronic fatigue as an illness has been understood and named over the past 150 years. The author traces how doctors have called similar conditions by different names—from 'neurasthenia' in the 1800s to 'myalgic encephalomyelitis,' 'chronic Epstein-Barr virus infection,' and 'fibromyalgia'—and explains how these separate medical concepts have recently begun to converge into what we now call chronic fatigue syndrome. The study shows that chronic fatigue became increasingly common in Europe and North America by the early 1900s, though it was rarely documented before the mid-1800s.
JAMA·1993
In the early 1990s, researchers tested whether retroviruses (a type of virus) could be identified in people with ME/CFS using available blood tests. The CDC study found that these retroviral tests could not reliably identify or confirm ME/CFS in patients. This helped clarify that ME/CFS was not caused by the retroviruses being tested at that time.
Edwards, R H, Gibson, H, Clague, J E et al.·Ciba Foundation symposium·1993
Researchers examined muscle tissue from 108 ME/CFS patients and 22 healthy people using microscopes to look for structural damage, and tested muscle strength before and after exercise. They found no consistent muscle damage that explained fatigue symptoms, and muscle strength worked normally even after exercise. The study suggests ME/CFS is not caused by a primary muscle disease.
Ewig, S·Deutsche medizinische Wochenschrift (1946)·1993
This is a review article about chronic fatigue syndrome (ME/CFS) published in a German medical journal. The author summarizes existing knowledge about the condition to help doctors and patients understand what was known about this illness in the early 1990s.
Ray, C, Weir, W, Stewart, D et al.·Social science & medicine (1982)·1993
Researchers created a questionnaire to understand how people with ME/CFS cope with their illness and manage day-to-day life. They found that patients use four main coping strategies: trying to stay active, adjusting to the illness, focusing on symptoms, and seeking information. These coping approaches were linked to how well patients functioned and their levels of anxiety and depression.
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.
Abbey, S E·Ciba Foundation symposium·1993
This paper explores how psychological factors, personal beliefs about illness, and social influences may play a role in ME/CFS. The author examines how things like perfectionism, how people cope with stress, and the way doctors and media talk about ME/CFS can affect whether someone develops the condition or how severe their symptoms become.
Bojić, I, Mijusković, P, Lilić, D et al.·Vojnosanitetski pregled·1993
This 1993 study examined whether Epstein-Barr virus (EBV)—a common virus that causes mononucleosis—might be connected to chronic fatigue syndrome (ME/CFS). Researchers compared a group of people with ME/CFS to a control group to see if EBV infection patterns differed between them. The study aimed to explore whether EBV could play a role in developing or maintaining ME/CFS symptoms.
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.
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.
Young, A·Journal of holistic nursing : official journal of the American Holistic Nurses' Association·1993
This study looked at Amma Therapy, a hands-on healing practice, as a possible way to help people with ME/CFS who feel frustrated with traditional medical care. The researcher examined how this holistic approach might benefit patients with chronic fatigue. The study suggests that some people with ME/CFS may find relief through this alternative therapy.
Cathébras, P, Bouchou, K, Charmion, S et al.·La Revue de medecine interne·1993
ME/CFS is a debilitating condition characterized mainly by extreme tiredness of unknown cause. Current diagnostic criteria don't clearly identify a single uniform group of patients, and no clear infectious or immune cause has been definitively proven, though some viruses and immune changes may play a role in some cases. Treatment options are limited but may include antidepressants and cognitive-behavioral therapy.
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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