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Chronic Fatigue: Causes, Symptoms and Treatment

Chronic fatigue is a persistent state of extreme exhaustion that is not relieved by sleep and significantly impairs daily functioning and quality of life.

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Things worth knowing about "Chronic Fatigue"

Chronic fatigue is a persistent state of extreme exhaustion that is not relieved by sleep and significantly impairs daily functioning and quality of life.

What is Chronic Fatigue?

Chronic fatigue refers to a prolonged state of physical and mental exhaustion lasting at least six months that does not improve substantially with rest or sleep. Unlike ordinary tiredness, it severely limits a person's ability to carry out daily activities, work, and maintain social relationships. In its most severe form, it is classified as Chronic Fatigue Syndrome (CFS) or Myalgic Encephalomyelitis (ME), often referred to together as ME/CFS.

Causes

Chronic fatigue can result from a wide range of physical and psychological conditions:

Infectious diseases: Viral infections such as Epstein-Barr virus (infectious mononucleosis), influenza, or COVID-19 (Long COVID) can trigger chronic fatigue.
Hormonal disorders: Hypothyroidism (underactive thyroid), adrenal insufficiency, or diabetes mellitus.
Mental health conditions: Depression, anxiety disorders, and burnout are frequently associated with chronic fatigue.
Autoimmune diseases: Conditions such as lupus erythematosus, rheumatoid arthritis, or multiple sclerosis.
Sleep disorders: Sleep apnea, insomnia, or restless legs syndrome.
Nutritional deficiencies: Low levels of iron, vitamin B12, vitamin D, or folate.
Cardiovascular diseases and anemia: Reduced oxygen supply to organs and muscles.
Chronic inflammation: Ongoing inflammatory processes within the body.

Symptoms

Chronic fatigue manifests through a variety of complaints, including:

Persistent, profound tiredness and lack of energy
Worsening of symptoms after physical or mental exertion (post-exertional malaise, PEM)
Difficulties with concentration and memory, commonly called brain fog
Unrefreshing sleep
Muscle and joint pain
Headaches
Sensitivity to light, noise, or temperature changes
Mood swings, irritability, or depressive episodes

Diagnosis

Diagnosing chronic fatigue is often a diagnosis of exclusion, as there is no single definitive test. Physicians conduct a thorough medical history and a range of investigations:

Blood tests (complete blood count, thyroid function, vitamin levels, inflammatory markers)
Urinalysis
Sleep studies (polysomnography)
Psychological evaluation
Additional specialized tests depending on the suspected underlying cause

For ME/CFS specifically, established diagnostic criteria such as the Canadian Consensus Criteria or the IOM Criteria (2015) are applied.

Treatment

Treatment depends on the underlying cause and is often multidisciplinary in approach:

Medical Treatment

Treating the underlying condition (e.g., thyroid hormones for hypothyroidism, iron supplementation for anemia)
Pain relievers or sleep aids when needed
Antidepressants for coexisting depression

Non-Medical Approaches

Pacing: Energy management to avoid overexertion, particularly important in ME/CFS
Cognitive Behavioral Therapy (CBT): Support in coping with fatigue and associated psychological symptoms
Sleep hygiene: Improving sleep quality through regular sleep schedules and relaxation techniques
Dietary adjustments: A balanced diet and correction of nutritional deficiencies
Psychosocial support: Self-help groups and therapeutic accompaniment

Lifestyle Measures

Stress reduction through techniques such as meditation or yoga
Moderate, adapted physical activity (only under medical guidance in ME/CFS)
Planning regular rest and recovery periods

When to See a Doctor?

Medical advice should be sought if fatigue persists for more than two to four weeks, significantly interferes with daily life, or is accompanied by additional symptoms such as fever, unexplained weight loss, or shortness of breath. Early evaluation is essential to identify and treat underlying causes in a timely manner.

References

Institute of Medicine (IOM): Beyond Myalgic Encephalomyelitis/Chronic Fatigue Syndrome: Redefining an Illness. National Academies Press, Washington D.C., 2015.
Fukuda K et al.: The Chronic Fatigue Syndrome: A Comprehensive Approach to Its Definition and Study. Annals of Internal Medicine, 1994;121(12):953-959.
World Health Organization (WHO): ICD-11 Classification of ME/CFS (8E49). Geneva, 2022.

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