Lipitor, also known as atorvastatin, is a medication used to lower cholesterol levels in the blood. According to the Mayo Clinic [2], muscle pain is a possible side effect of taking statins such as Lipitor. However, this side effect is usually temporary and goes away once the medication is stopped. Long-term muscle pain caused by Lipitor is not common but can occur in some cases. The British Heart Foundation [3] reports that scientists have identified a potential cause of statin-related muscle pain, which is related to the way the medication interacts with the body's energy production system. However, more research is needed to fully understand this relationship. It is important to note that while muscle pain is a possible side effect of Lipitor, it is not the only one, and the benefits of taking the medication may outweigh the risks for many people. As with any medication, it is important to discuss any concerns or potential side effects with a healthcare provider.

Sources:
[2] Mayo Clinic. Statin side effects: Weigh the benefits and risks. https://www.mayoclinic.org/diseases-conditions/high-blood-cholesterol/in-depth/statin-side-effects/art-20046013
[3] British Heart Foundation. Scientists identify potential cause of statin-related muscle pain. https://www.bhf.org.uk/what-we-do/news-from-the-bhf/news-archive/2019/august/scientists-identify-potential-cause-of-statin-related-muscle-pain