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Chronic fatigue syndrome — Clinical Guidelines

Overview

Chronic fatigue syndrome (CFS), also known as myalgic encephalomyelitis (ME/CFS), is characterized by persistent and debilitating fatigue not alleviated by rest, often accompanied by cognitive dysfunction, sleep disturbances, and post-exertional malaise 1 8.

Diagnosis

Key Diagnostic Criteria: Fukuda criteria, though noted to lack sensitivity and specificity; other definitions include Holmes criteria and newer evidence-based protocols 8.

Recommended Tests: Serum 25-hydroxyvitamin D levels may be considered, especially in cases post-COVID-19 vaccination 1.

Grading: No standardized grading system universally accepted; diagnosis often clinical with exclusion of other conditions 8.

Management

First-Line Treatments: Nutritional supplementation, particularly focusing on vitamin D and other micronutrients (B vitamins, vitamin C, magnesium, zinc) 1 5 12 15.

Adjunctive Therapies: Dietary modifications rich in nutrients (e.g., green vegetables, beef, whole milk) may be beneficial, especially in pediatric populations 7.

Therapies to Avoid: Exercise and cognitive behavioral therapies previously recommended but now under scrutiny due to lack of robust evidence 4.

Special Populations

Pediatrics: Nutrient-rich diets can potentially alleviate symptoms in children with unexplained fatigue 7.

Elderly: Micronutrient deficiencies may play a role in fatigue, warranting assessment and supplementation 12.

Comorbidities: No specific guidelines provided in abstracts; management should consider overlapping symptoms and potential interactions 10.

Key Recommendations

Evaluate serum 25-hydroxyvitamin D levels in patients with ME/CFS, particularly post-COVID-19 vaccination, to guide supplementation 1 (Evidence: Moderate).

Consider comprehensive nutritional support, including B vitamins, vitamin C, magnesium, and zinc, for symptom management 5 12 15 (Evidence: Weak).

Avoid recommending exercise and cognitive behavioral therapies as primary treatments due to limited evidence supporting their efficacy 4 (Evidence: Expert opinion).

References

1 Kodama S, Konishi N, Hirai Y, Fujisawa A, Nakata M, Teramukai S et al.. Efficacy of vitamin D replacement therapy on 28 cases of myalgic encephalomyelitis/chronic fatigue syndrome after COVID-19 vaccination. Nutrition (Burbank, Los Angeles County, Calif.) 2025. link 2 Couzin-Frankel J. Chronic fatigue study shows syndrome's complexity. Science (New York, N.Y.) 2024. link 3 . My experience of chronic fatigue syndrome. BMJ paediatrics open 2021. link 4 . UK Moves to Revise Guidelines for Treatment of Chronic Fatigue Syndrome. The American journal of nursing 2021. link 5 Joustra ML, Minovic I, Janssens KAM, Bakker SJL, Rosmalen JGM. Vitamin and mineral status in chronic fatigue syndrome and fibromyalgia syndrome: A systematic review and meta-analysis. PloS one 2017. link 6 Osterman JW. Comment on Detection of Mycotoxins in Patients with Chronic Fatigue Syndrome. Toxins 2013, 5, 605-617. Toxins 2016. link 7 Steenbruggen TG, Hoekstra SJ, van der Gaag EJ. Could a change in diet revitalize children who suffer from unresolved fatigue?. Nutrients 2015. link 8 Morris G, Maes M. Case definitions and diagnostic criteria for Myalgic Encephalomyelitis and Chronic fatigue Syndrome: from clinical-consensus to evidence-based case definitions. Neuro endocrinology letters 2013. link 9 Quinn C. A mystery no more. Nursing standard (Royal College of Nursing (Great Britain) : 1987) 2010. link 10 Evans KM, Flanagan DE, Wilkin TJ. Chronic fatigue: is it endocrinology?. Clinical medicine (London, England) 2009. link 11 Paralikar V, Agashe M, Oke M, Dabholkar H, Abouihia A, Weiss MG. Prevalence of clinically significant functional fatigue or weakness in specialty outpatient clinics of Pune, India. Journal of the Indian Medical Association 2007. link 12 Huskisson E, Maggini S, Ruf M. The role of vitamins and minerals in energy metabolism and well-being. The Journal of international medical research 2007. link 13 Rietjens GJ, Kuipers H, Adam JJ, Saris WH, van Breda E, van Hamont D et al.. Physiological, biochemical and psychological markers of strenuous training-induced fatigue. International journal of sports medicine 2005. link 14 Shephard RJ. Chronic fatigue syndrome. A brief review of functional disturbances and potential therapy. The Journal of sports medicine and physical fitness 2005. link 15 Werbach MR. Nutritional strategies for treating chronic fatigue syndrome. Alternative medicine review : a journal of clinical therapeutic 2000. link 16 Gushue J. Increasing workplace stress means occupational medicine will be a growth area. CMAJ : Canadian Medical Association journal = journal de l'Association medicale canadienne 1996. link 17 Van Amberg RJ. Idiopathic chronic fatigue. A primary disorder. New Jersey medicine : the journal of the Medical Society of New Jersey 1990. link 18 Ellis J. Malaise and fatigue. British journal of hospital medicine 1984. link 19 Swanson DW, Moore GL, Nobrega FT. Family history of alcoholism in patients with chronic fatigue. The Journal of clinical psychiatry 1978. link

Chronic fatigue syndrome