Below is an instruction from Human. Write a response.
    ### Instruction:
    What are the symptoms of Chronic Fatigue Syndrome (CFS) ?
    ### Response:
    Chronic fatigue syndrome can be misdiagnosed or overlooked because its symptoms are similar to so many other illnesses. Fatigue, for instance, can be a symptom for hundreds of illnesses. Looking closer at the nature of the symptoms though, can help a doctor distinguish CFS from other illnesses.
    