Glossary
Glossary
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- Chronic fatigue syndrome (CFS)
- A condition of prolonged and severe tiredness or fatigue that is not relieved by rest and is not directly caused by other conditions. The exact cause of CFS is unknown. Some researchers suspect a virus may cause it, although no distinct viral cause has been identified. Symptoms of CFS are much like symptoms of most common viral infections (muscle aches, headache and fatigue); symptoms often develop within a few hours or days and can last for months or years.
