Chronic Fatigue Syndrome

Chronic Fatigue Syndrome (Myalgic Encephalomyelitis)

Chronic Fatigue Syndrome (CFS), also known as Myalgic Encephalomyelitis (ME/CFS), is a long-term, complex medical condition characterized by severe, persistent fatigue that is not improved by rest and significantly interferes with daily activities. The exact cause is unknown, and symptoms can vary widely in severity and duration.

Key Characteristics

The fatigue associated with ME/CFS:

  • Lasts six months or longer

  • Is not caused by ongoing exertion

  • Is not substantially relieved by rest

  • Results in a marked reduction in previous levels of activity

Common Symptoms

Symptoms may fluctuate over time and can worsen after physical or mental exertion.

  • Extreme fatigue

  • Post-exertional malaise (PEM) – worsening of symptoms after activity

  • Unrefreshing sleep

  • Cognitive difficulties (“brain fog,” trouble concentrating or remembering)

  • Muscle or joint pain without swelling

  • Headaches of a new or different pattern

  • Sore throat or tender lymph nodes

  • Dizziness or lightheadedness, especially when standing

  • Sensitivity to light, sound, or temperature

Possible Causes

The exact cause of ME/CFS is not fully understood. Research suggests it may involve a combination of factors, including:

  • Viral or bacterial infections

  • Immune system dysfunction

  • Hormonal imbalances

  • Genetic predisposition

  • Physical or emotional stress triggering onset

Diagnosis

There is no single test for ME/CFS. Diagnosis is typically made by:

  • Reviewing medical history and symptoms

  • Ruling out other conditions with similar symptoms

  • Confirming the presence of core symptoms, including post-exertional malaise

A healthcare professional may use established diagnostic criteria to guide evaluation.

Management and Treatment

There is currently no cure for ME/CFS, but symptoms can often be managed with individualized care plans.

Common approaches include:

  • Activity management (pacing) to avoid symptom flare-ups

  • Sleep support and healthy sleep routines

  • Pain management, when needed

  • Cognitive and emotional support, including counseling

  • Treatment of co-existing conditions such as anxiety, depression, or sleep disorders

Management strategies should be tailored to each individual and supervised by a healthcare provider.