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ME/CFS – Causes, Symptoms and Treatment

ME/CFS is a severe chronic illness causing extreme fatigue, cognitive impairment, and post-exertional malaise that significantly reduces quality of life.

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Things worth knowing about "ME/CFS"

ME/CFS is a severe chronic illness causing extreme fatigue, cognitive impairment, and post-exertional malaise that significantly reduces quality of life.

What is ME/CFS?

ME/CFS stands for Myalgic Encephalomyelitis / Chronic Fatigue Syndrome. It is a serious, chronic, and complex multi-system disease affecting the nervous system, immune system, and energy metabolism. People with ME/CFS experience an overwhelming, unrefreshing fatigue that is not relieved by sleep or rest. For many years, the condition was misunderstood or dismissed. Today, ME/CFS is classified by the World Health Organization (WHO) as a neurological disorder.

Causes

The exact causes of ME/CFS are not yet fully understood. Common triggers include:

Viral or bacterial infections: ME/CFS frequently begins after an infection, such as Epstein-Barr virus, enteroviruses, or – increasingly recognized – SARS-CoV-2 (Long COVID-associated ME/CFS).
Immune dysregulation: Chronic low-grade inflammation and possible autoimmune processes are under investigation.
Mitochondrial dysfunction: Impaired cellular energy production is thought to play a central role.
Autonomic nervous system dysregulation: Many patients show signs of orthostatic intolerance and altered heart rate variability.

Symptoms

The hallmark symptom of ME/CFS is Post-Exertional Malaise (PEM) – a worsening of all symptoms following physical or mental exertion that can last for hours or days. Other common symptoms include:

Extreme, persistent fatigue not relieved by sleep
Cognitive impairment (often called brain fog): difficulty concentrating and memory problems
Unrefreshing sleep
Orthostatic intolerance (dizziness or fainting when standing up)
Muscle and joint pain
Headaches
Swollen lymph nodes and sore throat
Hypersensitivity to light, noise, or smell

Diagnosis

There is currently no specific blood test or biomarker for ME/CFS. Diagnosis is made clinically using established diagnostic criteria:

Canadian Consensus Criteria (CCC, 2003)
International Consensus Criteria (ICC, 2011)
IOM Criteria (2015): Systemic Exertion Intolerance Disease (SEID)

Other conditions must be excluded before a diagnosis is made (e.g., thyroid disorders, depression, sleep apnea). Symptoms must be present for at least 6 months and cause significant functional impairment.

Treatment

There is currently no curative treatment for ME/CFS. Management focuses on symptom relief and includes:

Pacing and Energy Management

Pacing is the most important strategy: patients learn to manage their activities within their personal energy limits to avoid triggering PEM episodes. Graded Exercise Therapy (GET) is no longer recommended by most ME/CFS specialists, as it can worsen symptoms.

Symptomatic Treatment

Management of sleep disturbances
Pain management (e.g., low-dose analgesics or anti-inflammatories)
Treatment of orthostatic intolerance (e.g., increased salt and fluid intake, compression stockings)
Support for cognitive symptoms related to brain fog

Psychosocial Support

Because ME/CFS often leads to social isolation and emotional distress, psychosocial support is an important part of care. Cognitive Behavioral Therapy (CBT) may be used as a coping tool – but not as a cure or primary treatment for the underlying condition.

Severity Levels

ME/CFS is categorized into different levels of severity:

Mild: Reduced activity levels, but may still work part-time
Moderate: Significantly reduced mobility, often housebound
Severe: Largely bedridden, requiring substantial care
Very Severe: Fully bedridden, dependent on intensive care support

ME/CFS and Long COVID

Awareness of ME/CFS has grown substantially since the COVID-19 pandemic. A significant proportion of individuals with Long COVID meet the diagnostic criteria for ME/CFS. This has greatly accelerated global research efforts and provided new insights into the pathophysiology of both conditions.

References

World Health Organization (WHO): International Classification of Diseases (ICD-11) – G93.3 Postviral fatigue syndrome. Geneva, 2022.
National Academies of Sciences, Engineering, and Medicine: Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome – Redefining an Illness. Washington D.C.: The National Academies Press, 2015.
Komaroff AL, Lipkin WI: Insights from myalgic encephalomyelitis/chronic fatigue syndrome may help unravel the pathogenesis of post-acute COVID-19 syndrome. Trends in Molecular Medicine, 2021.

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