Why Statins Might Cause Muscle Pain

Statins are a group of cholesterol-lowering medications that work by blocking a key protein, HMG-CoA reductase, which is responsible for making cholesterol in the liver. These drugs are effective at reducing strokes and heart attack.

Millions of Americans take statins because they effectively target all aspects of your lipid profile by lowering LDL cholesterol and triglycerides while raising HDL cholesterol. However, like most medications, there are potential side effects.

Side effects of statins include:

  • Muscle pain as the most common side effect
  • An increase in production of enzymes in the liver as an occasional side effect
  • Muscle and liver damage as a rare side effect
  • Digestive problems, including gas, diarrhea or nausea, as a rare side effect
  • An increase in blood sugar, which may lead to developing type 2 diabetes, is a small, but possible risk
  • Reversible neurological side effects, including memory loss and confusion, is a warning from the U.S. Food and Drug Administration that appears on statin labels

A Side Effect of Statins Is Muscle Pain

About 5 to 10% of patients taking statins experience statin-associated muscle symptoms (SAMS) and mild myalgia. Symptoms may appear within the first six months of treatment or appear after several years.

When it comes to muscular pain, the side effects can range from mild muscle weakness to life-threatening rhabdomyolysis, which is rare. Your risk of muscle damage while taking statins depends on a variety of factors, including:

  • Being over 80
  • Having a smaller body frame
  • Drinking alcohol excessively
  • Being female
  • Having certain conditions like hypothyroidism
  • Suffering prior muscle problems

A study published in a 2016 issue of the "New England Journal of Medicine" shows statin-associated autoimmune myopathies are also a side effect of statins. This serious muscle wasting condition is rare and occurs in a fraction of patients.

Why Statins Cause Muscle Pain

Previous studies show that the gene atrogin-1 turns on at the beginning stages of the breakdown of muscle (muscle wasting), which is associated with illnesses such as cancer, sepsis, and AIDS. When the atrogin-1 gene is not active, muscle wasting does not occur.

Scientists at Beth Israel Deaconess Medical Center in Boston, Massachusetts felt that atrogin-1 might also play a role in the development of myopathies in those taking statins. To test this, the investigators gave a statin, Mevacor (lovastatin), to cultured muscle cells, zebrafish, and humans.

Researchers found that humans taking lovastatin had higher levels of atrogin-1 than those not taking the drug. The more Mevacor given to the cells and zebrafish, the more likely it was that muscle damage would occur. When atrogin-1 was removed from the cells, the drug did not cause muscle damage.

This information is preliminary, but it provides an understanding of what may be causing muscle pain in statin users, and why some individuals taking statins may be more susceptible to this than others.

In the future, this may allow your healthcare professional to identify if you are at risk for statin-related myopathies, ranging from mild muscle pain to life-threatening rhabdomyolysis. Additionally, scientists may be able to manipulate this gene, or others involved, to prevent muscle damage caused by statins.

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