Chronic Fatigue Syndrome (ME/CFS): Symptoms, Causes & Treatment

Chronic fatigue syndrome, also known as myalgic encephalomyelitis, is a complex, multisystem chronic illness characterized by severe, debilitating fatigue lasting six months or more, not explained by current exertion and not improving with rest or sleep. It severely affects the ability to perform usual daily activities.

The most distinctive feature of this syndrome is the phenomenon of post-exertional malaise: a severe worsening of symptoms after physical or mental effort even if minor, which may be delayed by hours or a day and last for days. Other symptoms include unrefreshing sleep that does not restore energy, difficulty with concentration and memory (brain fog), dizziness on standing, muscle and joint pains, headache, and sensitivity to light and sound.

It is very important to affirm that chronic fatigue syndrome is not laziness, psychological weakness, or depression, but a real, recognized medical condition, although its exact cause is not yet known and its onset may be linked to a previous infection. There is no single test that confirms it, so it is diagnosed clinically after ruling out other diseases. There is no curative treatment yet, and management relies on a supportive approach: most importantly activity pacing, that is, carefully balancing effort and rest to avoid post-exertional malaise, treating symptoms such as sleep disturbance and pain, and psychological support. Understanding and correct diagnosis are an essential step to improving the patient's quality of life.

• Severe debilitating fatigue not improving with rest (6 months or more).
• Post-exertional malaise (worsening of symptoms after minor effort).
• Unrefreshing sleep that does not restore energy.
• Difficulty with concentration and memory (brain fog) and dizziness on standing.
• Muscle and joint pains and headache.

• The exact cause is not yet known.
• Its onset may be linked to a previous viral infection or severe stress.
• An immune, neurological, and energy-production disturbance is thought to play a role.

• Clinical diagnosis based on the characteristic symptom pattern and its persistence.
• Tests to rule out other diseases (there is no confirmatory test).
• A comprehensive assessment of the multiple symptoms.

Activity pacing (the cornerstone)

• Carefully balancing effort and rest (pacing) to avoid post-exertional malaise, and avoiding overexertion.

Symptom treatment and support

• Improving sleep and treating pain and dizziness on standing.
• Psychological support, good nutrition, and stress management.

There is no curative treatment yet. This content is educational and does not replace medical advice.

• Severe impact on work, study, and social life.
• Accompanying anxiety and depression.
• Symptom worsening with overexertion.

• There is no proven prevention, and early management improves the course.
• Activity pacing and avoiding excessive exertion.
• Psychological support and understanding the nature of the disease.