Chronic fatigue

Chronic Fatigue Syndrome (CFS), also known as Myalgic Encephalomyelitis (ME) or Systemic Exertion Intolerance Disease (SEID), is a complex, long-term illness that affects many body systems. People with CFS experience extreme fatigue, sleep abnormalities, pain, and other symptoms that are made worse by exertion. The cause of CFS is unknown, though it may involve a combination of genetic, environmental, and psychological factors.

Symptoms

The primary symptom of CFS is persistent fatigue that doesn't improve with rest and is not caused by other medical conditions. Other common symptoms include:

• Cognitive impairments, often described as "brain fog," including problems with memory, concentration, and processing information
• Sleep disturbances, such as unrefreshing sleep or insomnia
• Muscle and joint pain without redness or swelling
• Headaches of a new type, pattern, or severity
• Sore throat and tender lymph nodes
• Post-exertional malaise (PEM), where symptoms worsen after physical or mental exertion

Diagnosis

Diagnosing CFS can be challenging, as there is no single test to confirm the condition. Diagnosis involves ruling out other potential causes of fatigue through medical history, physical exams, and laboratory tests. The Centers for Disease Control and Prevention (CDC) criteria for CFS/ME diagnosis require:

• A detailed patient history and physical examination
• At least four of the aforementioned symptoms to be present for six months or more
• Exclusion of other health conditions that could explain the symptoms

Treatment

There is currently no cure for CFS, but treatment can help manage symptoms. Treatment plans are tailored to the individual's symptoms and may include:

• Cognitive Behavioral Therapy (CBT) to help manage the illness
• Graded Exercise Therapy (GET) for some patients, though this approach is controversial and may not be suitable for everyone
• Medications to manage pain, sleep disturbances, and other specific symptoms
• Lifestyle changes, including pacing activities and energy management strategies

Etiology

The exact cause of CFS is unknown, but several factors may contribute to its development, including:

• Viral infections, such as Epstein-Barr virus or human herpesvirus
• Immune system problems
• Hormonal imbalances
• Genetic predisposition
• Stress

Prognosis

The prognosis for individuals with CFS varies. Some people may experience periods of remission, while others may have persistent symptoms for years. A small percentage of patients may improve significantly over time, but many continue to experience limitations in their daily activities.

Epidemiology

CFS affects people of all ages, races, and socioeconomic backgrounds, though it is most common in women between the ages of 40 and 60. The prevalence of CFS is estimated to be between 836,000 and 2.5 million individuals in the United States alone.

See Also

• Fibromyalgia
• Post-viral fatigue syndrome
• Sleep disorder