Lipitor is a brand name for the drug atorvastatin, which belongs to a class of drugs known as statins. Statins are used to lower cholesterol levels in the blood. Joint pain is a known side effect of statins, including Lipitor.

The symptoms of Lipitor-induced joint pain can vary from person to person, but typically involve pain, stiffness, and swelling in the joints. This can occur in any joint in the body, but is most commonly reported in the knees, hips, and hands. The pain may be mild or severe and can interfere with daily activities such as walking, climbing stairs, or using the hands.

According to GoodRx [2], joint pain is one of the most common side effects of statins, including Lipitor. It is estimated that up to 10% of people taking statins experience joint pain. The onset of joint pain can occur at any time during treatment with Lipitor, from a few days to several months after starting the medication.

Drugwatch [3] also notes that some people may experience muscle pain or weakness in addition to joint pain while taking Lipitor. This can be a sign of a more serious condition known as rhabdomyolysis, which requires immediate medical attention.

If you are experiencing joint pain while taking Lipitor, it is important to speak with your healthcare provider. They may recommend adjusting the dosage of the medication or switching to a different statin. In some cases, joint pain may be a sign of an underlying condition such as arthritis, which would require further evaluation and treatment.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/LIPITOR
[2] https://www.goodrx.com/classes/statins/joint-pain
[3] https://www.drugwatch.com/lipitor/side-effects/