CFS

The kind of lethargic, extreme fatigue that leaves you exhausted to your very core might be caused by what is known as chronic fatigue syndrome (CFS).

What Is Chronic Fatigue Syndrome? 9 Things To Watch For If You're Tired All The Time

The kind of lethargic, extreme fatigue that leaves you exhausted to your very core might be caused by what is known as chronic fatigue syndrome (CFS).

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