(HealthDay News) -- Chronic fatigue syndrome is characterized by extreme tiredness and a feeling of being worn out all the time, even after waking up. Its cause isn't understood.
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The U.S. National Women's Health Information Center says chronic fatigue syndrome may have these symptoms:
- Extreme tiredness for longer than 24 hours, especially after exercise.
- Forgetfulness, or difficulty maintaining focus.
- Tiredness that persists after sleep.
- Muscular aches and pains.
- Joint pain that isn't accompanied by redness or swelling.
- Headaches that vary in severity, pattern or type.
- Soreness of the lymph nodes beneath the arm or in the neck.
- Sore throat.
-- Diana Kohnle
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