Chronic fatigue syndrome
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Chronic fatigue syndrome refers to severe, continued tiredness that is not relieved by rest and is not directly caused by other medical conditions.
CFS may be due to:
  • Epstein-Barr virus or human herpes virus-6 (HHV-6); however, no specific virus has been identified as the cause
  • Innflammation in the nervous system, because of a faulty immune system response
The following may also play a role in the development of CFS:
  • Age
  • Previous illnesses
  • Stress
  • Genetics
  • Environmental factors
CFS most commonly occurs in women ages 30 to 50.

Symptoms of CFS are similar to those of the flu and other common viral infections, and include muscle aches, headache, and extreme fatigue. However, symptoms of CFS last for 6 months or more.

The people affected by this syndrome mostly feel weak most of the time all day long. They seem to have difficulty in sleeping and also in concentrating in any work they do. The main factor for the existence of this condition may be weakened immune system.