It’s my understanding that Crestor is less likely to cause muscle pain, but it still can. The larger risk with Crestor is liver damage (which happened to my dad), but that’s a whole other topic…

Usually, they would run a blood test for elevated creatinine kinase. If it’s elevated it would suggest rhabdo, as @pomegranet1 mentioned, and it’s very serious.

But short of that, it’s hard to tell if it’s the cause. This happened to my dad, and they had him take a “medication holiday,” meaning he stopped taking his statin (atorvastatin) for a few weeks to see if the side effects went away. Unfortunately we never got that far to figure it out because he ended up getting diagnosed with polymyalgia rheumatica (PMR) an autoimmune arthritis that causes severe pain in the large muscles. It can also be triggered by statin use. I don’t mean to scare you…he just, has a unique and very unfortunate situation, and that’s how I know about the creatinine kinase test.