Worth a read and possibly printing out for MD's (I only copied a couple paragraphs from the article). It's worth reading the entire article which is at the link below.
From the ME Association:
Myalgic encephalomyelitis (ME), also referred to in the literature as chronic fatigue syndrome (CFS), is a complex disease involving profound dysregulation of the central nervous system (CNS) [1-3] and immune system [4-8], dysfunction of cellular energy metabolism and ion transport [9-11], and cardiovascular abnormalities [12-14]. The underlying pathophysiology produces measurable abnormalities in physical and cognitive function and provides a basis for understanding the symptomology. Thus, the development of International Consensus Criteria that incorporate current knowledge should advance the understanding of ME by health practitioners, and benefit both the physician and patient in the clinical setting as well as clinical researchers.
Using “fatigue” as a name of a disease gives it exclusive emphasis and has been the most confusing and misused criterion.
No other fatiguing disease has “chronic fatigue” attached to its name – e.g. cancer/chronic fatigue, multiple sclerosis/chronic fatigue – except ME/CFS. Fatigue in other conditions is usually proportional to effort or duration with a quick recovery, and will recur to the same extent with the same effort or duration that same or next day.
The pathological low threshold of fatigability of ME described in the following criteria often occurs with minimal physical or mental exertion, and with reduced ability to undertake the same activity within the same or several days.
The International Consensus Criteria (Table 1) identify the unique and distinctive characteristic patterns of symptom clusters of ME.