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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