This is a diagram of proposed interactions of various muscle abnormalities to pain and muscle dysfunction in fibromyalgia. It was hypothesized that any condition that could lead to constant muscle hypoxia and prolonged energy deficiency might be a cause of fibromyalgic pain.
If you need to complete the pathophysiology of myalgia, you can download it in this Rheumatology Article, 5 pages of pdf filetype (source: rila.co.uk).
