
Fibromyalgia is constantly evolving and has a slow progression
rate. It will typically appear in two ways :
Primary fibromyalgia : gradual appearance
of symptoms, going back as far as early childhood.
Secondary fibromyalgia : a series of aches
and pain that are triggered by a particular event.
Here is a graph that show the progression
of the disease in 1298 people with fibromyalgia. They were monitored
over a 16 year period.1

We can see that the intensity of the symptoms varies over time. Often
a person may have periods where the symptoms diminish significantly
followed by a period where they increase. Furthermore, this graph allows
us to conclude that fibromyalgia is a disease that evolves over time
and has a slow rate of progression. On average, the intensity of the
symptoms doubled over a 16-year period.
1 F.Wolfe, D.j. Hawley, 1998
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