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Health A-Z

What is chronic fatigue syndrome?

Myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) or chronic fatigue syndrome (CFS) is a condition that causes you to feel so tired and exhausted that it interferes with your ability to complete your daily routine or even get out of bed. Your fatigue doesn’t improve with rest and gets worse after physical activity or mental exertion. Symptoms usually last for six months or longer.

A healthcare provider may refer to CFS as:

  • Myalgic encephalomyelitis (ME).
  • Systemic exertion intolerance disease (SEID).

How common is chronic fatigue syndrome?

Chronic fatigue syndrome affects an estimated 836,000 to 2.5 million people in the United States. About 90% of people who experience chronic fatigue syndrome don’t receive a diagnosis even though they live with this condition. The main barriers that prevent people from getting a diagnosis are access to healthcare and awareness of the condition.