What is Chronic Fatigue Syndrome?
Chronic fatigue syndrome (CFS) (also referred to as Myalgic Encephalitis [ME], and chronic fatigue immune dysfunction syndrome [CFIDS] is a hotly debated topic, with opinions diverging on its cause or causes. The core symptom of this disorder is severe fatigue, which is worsened by activity (post-exertional fatigue). So, while most people feel better after exercise, people with CFS feel worse, and have difficulty recovering (it usually takes a person with CFS more than 24 hours to recover). Associated with this core symptom are a variety of other symptoms including but not limited to: sore throat, tender lymph nodes, short or long term memory problems, muscle pain, headaches which are new (i.e., didn’t pre-exist the onset of the fatigue), joint pains, and unrefreshing sleep. These symptoms must have persisted or recurred during six or more consecutive months of illness, must not have predated the fatigue, and must not be caused by a known medical condition.
You should note, that there is even controversy over the definition above, and there is no laboratory marker that is positive or proves the existence of the syndrome.