Well this is news to me as I didn't even know there was Primary and Secondary Fibromyalgia! Apparently 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. Researchers led by Frederick Wolfe, MD, of the National Data Bank for Rheumatic Diseases and the University of Kansas in Wichita, studied patients with primary and secondary diagnoses to see if they “had the same level of outcomes, symptoms, and characteristics” at different points across the polysymptomatic distress (PSD) scale. PSD is a measure to assess the severity in fibromyalgia. I also have never heard of this even though I have Fibromyalgia. As far as I am aware no doctor has ever used this scale on me, and I have seen many specialists. The researchers state that the "PSD can identify criteria-positive FM with > 90% accuracy." The PSD is calculated by combining two measurements used in fibromyalgia: the widespread pain index (WPI), which counts the number of painful regions in the body, and the somatic symptom scale (SSS), which measures fatigue, sleep, emotional and cognitive problems, and the extent of symptom reporting. In their research they studied 1525 patients with a clinical diagnosis of FM and 12,037 patients with rheumatoid arthritis (RA). Their Conclusion was that PFM and SFM are equivalent regarding the symptom burden. But what this new research also shows, Dr Wolfe said, is that while up to now “you couldn’t easily study people with fibromyalgia [in other disorders], it doesn’t matter if you have RA or another disorder in addition to fibromyalgia. You get the full spectrum or severity regardless. The underlying disease wouldn’t affect your identification of the fibromyalgia symptoms.” This research Primary and Secondary Fibromyalgia Are The Same: The Universality of Polysymptomatic Distress was published online in the Journal of Rheumatology in July 2018. RESOURCES: Rheumatology News and The Journal of Rheumatology MY TAKE ON THIS: As I had never heard of these terms PFM and SFM I am wondering if they are terms used a lot in the US and not in Australia where I live. As I have 3 autoimmune diseases as well as Fibromyalgia I was interested to find out that I had SFM but then this report really says they should be treated as the same condition!