response: It's fatigue that is not due to strenuous exertion and rest doesn't really provide much relief. Also, the fatigue is not from a previous medical condition.
original_response: It's fatigue that is not due to strenuous exertion and rest doesn't really provide much relief. It's not due to a previous medical condition, so its cause remains somewhat of a mystery.
history: Have you ever heard of Chronic fatigue syndrome? I understand that a diagnosis is based on the symptoms a person is experiencing. It sounds like something that would be awful, what are some of the characteristics of it?
knowledge: The fatigue is not due to strenuous ongoing exertion, is not much relieved by rest, and is not due to a previous medical condition. Fatigue is a common symptom in many illnesses, but the unexplained fatigue and severity of functional impairment in CFS is comparatively rare.