difficulty sleeping
headaches
irritable bowel syndrome (IBS)
muscle stiffness
What causes fibromyalgia?
The exact causes are not known, but there are certain changes in the way the body functions which have been noticed in people with fibromyalgia, including:
disturbed pain messages
low levels of hormones
sleep problems
However, it is not clear what causes these changes in the first place and how they lead to fibromyalgia.
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source: http://www.nhs.uk/Conditions/Fibromyalgia/Pages/Introduction.aspx
