By Karen Lee Richards
It's often difficult to distinguish between fibromyalgia and chronic fatigue syndrome.
  Are they unrelated, siblings or twins?  Researchers and specialists 
are still trying to determine the answer to this question.  Some experts
 believe they are two completely separate illnesses; others think they 
are two distinct disorders with many similar symptoms; still others feel
 they are different facets of the same disorder.
To complicate matters, a significant number of people with FM also have CFS and vise versa.  In a September 2002 article in Fibromyalgia AWARE, a publication of the National Fibromyalgia Association,
  Charles W. Lapp, MD, CFS/FM expert and researcher, states that "about 
70 percent of persons with CFS meet criteria for FM and about 70 percent
 of persons with FM also meet criteria for CFS."
Central Sensitivity Syndromes: Muhammad
 B. Yunus, MD, a pioneer FM researcher, believes that there is a large 
group of illnesses with overlapping features that he calls "Central 
Sensitivity Syndromes." What they all have in common is a sensitization 
of the central nervous system.  Under this broad CSS category, he lists 
disorders such as FM, CFS, migraines, irritable bowel syndrome, TMJ, 
multiple chemical sensitivities, restless legs syndrome, myofascial pain
 syndrome, and others.  All of these illnesses have some symptoms that 
overlap one another.
FM and CFS Similarities: Fibromyalgia
 and chronic fatigue syndrome share many of the same symptoms, such as: 
muscle and/or joint pain, debilitating fatigue, headaches, memory loss, 
difficulty with concentration, forgetfulness, depression, numbness and 
generalized weakness. Other clinical similarities include:
- Reduced blood flow in the cerebral cortex and midbrain
 - Suppression of the hypothalamic pituitary axis
 - Disturbed Stage 4 sleep
 - Reduced levels of growth hormone
 - Lower than normal serotonin levels
 - Evidence of a genetic component
 
FM and CFS Differences: The
 simplest explanation of the difference between FM and CFS is that with 
FM, pain is the most predominant symptom, while with CFS, extreme 
fatigue with  is most predominant.
Additional distinct differences include:  
How Is a Diagnosis Determined?: Because
 the two illnesses are so similar, frequently the diagnosis you receive 
will depend upon the doctor you see.  A rheumatologist is more likely to
 give you a fibromyalgia diagnosis, whereas if you consult an infectious
 disease specialist, you’ll be more apt to receive a diagnosis of 
chronic fatigue syndrome.  If your doctor is a general practitioner or a
 family practice physician, your diagnosis may depend on which illness 
they are more familiar with.  
For the specific diagnostic criteria of each, see:
- Substance P (a neurotransmitter that transmits pain signals) is elevated in FM but not CFS.
 - RNaseL (a cellular antiviral enzyme) is frequently elevated in CFS but not in FM.
 - Often CFS will be triggered by a flu-like or infectious illness, while FM is more often triggered by some kind of trauma to the body (i.e., accident, injury, surgery, etc.).
 
Source: About.com

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