Pain reported in association with RLS is the red headed step child of symptoms. I believe it is under reported, often misdiagnosed and not taken seriously by doctors and even by fellow RLS sufferers who experience no pain. We have enough evidence to know that RLS pain symptoms (like restlessness) occur on a spectrum from none to severe. From achiness or burning, to sharp pains or dull. Statistics would then suggest there are those who would manifest RLS as aches or pains only with little to no desire to move ones legs ever.
Because the definition of RLS must include a desire to move ones legs, I'm guessing there are sufferers out there with pain only symptoms who are being treated (if at all) for something completely different. They could be benefiting from RLS treatmeant like iron therapy or medications. They could be provided with information on RLS triggers to avoid to ease the pain. You get the point.
Makes me wonder if the diagnosis of RLS should be expanded in the future to include the possibility of pain only RLS.
I write this as on a personal note I do get pain only episodes of RLS. Some are definitely triggered related. They do resolve with my regular RLS treatment.