Well this article from News Medical Life Sciences was definitely of interest to me as I have both Fibromyalgia and Sjögren's Syndrome (SS). I was actually diagnosed with SS first and then when some symptoms did not fit with it the rheumatologist said I also had Fibro.
Studies have explored the possibility of fibromyalgia and Sjögren's syndromecoexisting in a patient. Researchers have found that fibromyalgia is more common in patients with primary Sjögren's syndrome who complain of fatigue as their main symptom.
Studies have shown that nearly 68% of patients with primary Sjögren's syndrome have fatigue as a major symptom.
Fatigue is a common symptom in 12% patients who have both fibromyalgia and primary Sjögren's syndrome as diagnosed by set criteria.
In addition patients with primary Sjögren's syndrome also have severe sleep problems that are seen in a large majority of these patients.
Fatigue, as well as dryness of the mucous membranes within the mouth as seen in primary Sjögren's syndrome is commonly seen in patients with fibromyalgia.
Fibromyalgia may present alone or in combination with other diseases like primary Sjögren's syndrome. (This correlates with what I have just found out - people classified as having primary fibromyalgia (PFM) have a defined set of pain, fatigue, cognitive, and psychological symptoms but do not have an inflammatory disorder. People classified as having secondary fibromyalgia (SFM) do have another inflammatory disease such as sjogren's syndrome or rheumatoid arthritis. Read more about this)
In patients with primary Sjögren's syndrome fibromyalgia has been found in 44 to 55% patients according to some studies.