Doctors never tell patients about side effects of prescribed drugs. Possibly many never read the published side effects. Most people never experience any side effects.

I had muscle pain in my legs after taking statin for 20 years. I cannot say for sure it was the statins or my neuropathy causing the muscle pains. I stopped takin statins (Zocor) and most of the muscle pain disapeared. There is still some lingering effect. Muscle pain and weakness from statins is sometimes irreversible.