Lipitor (atorvastatin) is a medication used to lower cholesterol levels in the blood. According to DrugWatch [3], some of the side effects of Lipitor include muscle pain, weakness, and tenderness, as well as abdominal pain and nausea. However, there is no mention of internal bleeding as a potential side effect.

A study published in the Journal of the American College of Cardiology [2] analyzed the safety of atorvastatin in patients with acute coronary syndrome. The study found that there was no increased risk of major bleeding in patients taking atorvastatin compared to those taking a placebo.

DrugPatentWatch [1] provides information on the patents and exclusivity of Lipitor, but does not mention anything about the risk of internal bleeding.

In conclusion, based on the sources provided, there is no evidence to suggest that Lipitor carries a risk of internal bleeding. However, it is important to note that all medications can have potential side effects and it is always important to discuss any concerns with a healthcare provider.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://pubmed.ncbi.nlm.nih.gov/30255477/
[3] https://www.drugwatch.com/lipitor/side-effects/