I've both queried and written about the possible roles that inflammation plays in RLS, but wanted to share what I recently learned, which again indicates that the relationship between the two is complicated.
I was recently on methyl prednisone for a few days to calm down post-surgery inflammation and pain, and my RLS got a LOT worse. I normally take 1 or at most 2 codeine-Tylenol #3 pills per night for RLS, but they had no effect. It turns out that prednisone counteracts opioids, which explains why codeine stopped working. But the bigger issue is: prednisone is a powerful anti-inflammatory. If inflammation exacerbates RLS, prednisone should have made it better, not worse. I've seen a tiny number of articles discussing the comorbidity of RLS with autoimmune and other inflammatory conditions, including this one that states that steroids do improve RLS in some: sciencedirect.com/science/a...
But in my case, steroids made things unbearable. So, I think this whole issue is more complicated than sometimes thought. I think there's also a mind-bogglingly high degree of individual variances with this condition. For example, there's the conventional wisdom that alcohol exacerbates RLS. But I have no RLS if I drink a glass of wine with dinner. But alas, I can't have much because it causes joint pain (yup, inflammation). Go figure.