Fatigue is a feeling of weariness, tiredness, or lack of energy that varies in degree, frequency, and duration. Everyone has experienced normal fatigue, which improves with rest. Chronic fatigue associated with a disease or treatment of a disease does not improve with rest and can seriously affect a person's ability to function and quality of life. Fatigue can impact quality of life in many different ways -- physically, emotionally, socially, and spiritually.
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