Statins: The Truth About Side Effects and Common Myths

Statins are medicines that lower LDL cholesterol, often called "bad cholesterol." They undeniably help prevent heart attacks, strokes, stents, bypass surgery, and cardiovascular death.

As cardiologists, we prescribe statins often because they work. But many patients also worry about side effects. That concern is understandable. The goal is not to dismiss symptoms, but to separate true statin side effects from symptoms that happen for other reasons.

What are the true side effects of statins?

The true risks are real but usually uncommon:

Muscle symptoms: Some people develop muscle aches, soreness, weakness, or cramps. Most muscle pain that occurs while taking a statin is not actually caused by the statin, but statins can cause muscle symptoms in a small percentage of patients. The excess risk is highest in the first year and is small overall.

Serious muscle injury: Rhabdomyolysis is a severe muscle breakdown. It is very rare, estimated at about 1 in 10,000 patients per year in trial data.

Blood sugar increase: Statins can slightly raise blood sugar and may move some patients with prediabetes into diabetes sooner. This risk is higher in people who already have prediabetes, obesity, metabolic syndrome, or other diabetes risk factors. For most patients, the heart and stroke protection is much greater than the diabetes risk.

Liver blood test changes: Mild liver enzyme increases can occur. Serious liver injury is rare. A 2026 Lancet review found a small increase in liver blood test abnormalities, but no increase in serious liver disease such as hepatitis or liver failure.

Digestive symptoms: Some people report nausea, constipation, diarrhea, or stomach discomfort, but large blinded trials have not shown that most digestive symptoms are clearly caused by statins more than placebo.

Memory or "brain fog" symptoms: Some patients report memory changes or mental cloudiness. However, large trial reviews have not found meaningful excess memory loss or dementia from statins compared with placebo.

Myth #1: "Statins are dangerous drugs."

Fact: For most people who need them, statins are safe and protective.

Every medication has possible side effects. But statins have been studied in hundreds of thousands of patients. The strongest evidence shows they reduce heart attacks, strokes, and cardiovascular death. Current ACC/AHA guidance continues to recommend statins as the foundation of cholesterol treatment for many patients, including those with known heart disease, LDL cholesterol of 190 mg/dL or higher, diabetes, or elevated cardiovascular risk.

Myth #2: "Most people get muscle pain from statins."

Fact: Muscle pain is common in life, but true statin-caused muscle pain is much less common.

Back pain, arthritis, exercise soreness, vitamin D deficiency, thyroid disease, and aging can all cause muscle symptoms. This is why it is easy to blame the statin when symptoms appear.

The SAMSON trial studied people who had stopped statins because of side effects. Participants took statin pills, placebo pills, and no pills during different months. Symptoms were much higher during pill months than no-pill months, but symptoms were almost the same with placebo as with the statin. The nocebo ratio was 0.90, meaning about 90% of the symptom burden also occurred with placebo.

That does not mean symptoms are "fake." It means the symptoms are real, but the statin is often not the true cause. The body is annoyingly talented at creating drama when it expects trouble.

Myth #3: "If I stop the statin and feel better, that proves the statin caused it."

Fact: Feeling better after stopping a pill does not always prove the pill caused the symptom.

SAMSON showed that symptoms improved after stopping both statin pills and placebo pills. The timing looked very similar. This matters because many patients understandably think, "I stopped it, I felt better, so that must be it." Sometimes that is true. But sometimes it is the normal ups and downs of symptoms, or the nocebo effect.

A better approach is a structured plan: stop briefly if needed, check for other causes, then restart with a lower dose, a different statin, or a different schedule like taking it on alternate days.

Myth #4: "If I had side effects once, I can never take a statin again."

Fact: Many patients can tolerate a different statin or a different dose.

Statin intolerance does happen, but true complete intolerance is uncommon. In the SAMSON trial, half of the patients who had previously stopped statins were able to restart after reviewing their own symptom data.

Common strategies include:

• Using a lower dose
• Switching from one statin to another
• Trying rosuvastatin or pravastatin, which are more water-soluble
• Taking the statin every other day in selected cases
• Checking thyroid levels, vitamin D, drug interactions, and exercise changes
• Adding non-statin medicines if LDL goals are not reached

The goal is not "statin at all costs." The goal is lowering cardiovascular risk in a way the patient can actually tolerate.

Myth #5: "Statins destroy the liver."

Fact: Serious liver damage from statins is rare.

Mild liver enzyme increases can happen, but they usually do not lead to liver failure. The 2026 Lancet review found only a small increase in liver blood test abnormalities and no increase in serious liver diseases such as hepatitis or liver failure.

Most guidelines recommend checking liver enzymes before starting a statin. Routine repeated liver testing is usually not needed unless symptoms develop, such as yellow skin, dark urine, severe fatigue, or unexplained abdominal pain.

Myth #6: "Statins cause dementia."

Fact: Good evidence does not show that statins cause dementia.

This is one of the most common fears. Some people report memory issues while taking statins, and those symptoms should be discussed with a clinician. But large blinded trial data do not show a meaningful increase in memory loss or dementia from statins compared with placebo. In one large review, cognitive or memory impairment was reported at about the same rate in statin and placebo groups.

Also, preventing strokes and vascular disease may help protect long-term brain health. A healthy brain likes good blood flow. Very picky organ.

Myth #7: "Statins cause diabetes, so nobody with prediabetes should take them."

Fact: Statins can slightly increase blood sugar, but they also prevent heart attacks and strokes.

This is a real side effect, not a myth. The risk is mainly seen in people already close to diabetes. Statins may move the diagnosis earlier in some patients with prediabetes. But for patients at moderate or high cardiovascular risk, the benefit usually outweighs the risk.

For example, a patient with diabetes or prediabetes is already at higher risk for heart disease. That is exactly why cholesterol lowering matters. The right response is usually not to stop the statin, but to monitor A1c, improve diet and exercise, manage weight, and choose the right statin intensity.

Myth #8: "Natural supplements are safer and work just as well."

Fact: Supplements are not a substitute for proven statin therapy in high-risk patients.

Lifestyle is powerful. A heart-healthy diet, exercise, weight management, sleep, and not smoking all matter. But supplements are not tested as carefully as statins, and most do not lower LDL enough to replace statins in patients who truly need them.

Red yeast rice, for example, may contain a statin-like compound, but the dose can vary widely. Some products may also contain contaminants. "Natural" does not always mean safer. Poison ivy is natural; cardiologists remain unimpressed.

Myth #9: "Once my cholesterol improves, I can stop the statin."

Fact: Cholesterol often improves because the statin is working.

Stopping the statin usually allows LDL cholesterol to rise again. Statins work like blood pressure medicine: they control a risk factor. They do not permanently cure the tendency toward high cholesterol or plaque buildup.

For many patients, especially those with prior heart attack, stroke, stent, bypass surgery, diabetes, or very high LDL, statins are long-term prevention medicines.

Myth #10: "All statins are the same."

Fact: Different statins have different strengths, doses, and properties.

Atorvastatin and rosuvastatin are commonly used high-intensity statins. Pravastatin and rosuvastatin are more water-soluble, which may help some patients who report muscle symptoms, although this does not guarantee fewer symptoms for everyone.

Some statins interact more with other medicines. This is why your medication list matters. Always tell your clinician about antibiotics, antifungals, HIV medicines, transplant medicines, fibrates, and supplements.

Myth #11: "If I cannot take a statin, there are no other options."

Fact: There are several non-statin options.

Statins are usually first choice because they have strong outcome data, are affordable, and work well. But if LDL remains high or a patient cannot tolerate enough statin, other options can help.

These include ezetimibe, PCSK9 inhibitors, inclisiran, and bempedoic acid. The 2022 ACC Expert Consensus Pathway recommends ezetimibe as an initial non-statin add-on in many patients with atherosclerotic vascular disease who need more LDL lowering despite maximally tolerated statin therapy.

When should you call your clinician?

Call your healthcare team if you develop:

• Severe muscle pain or weakness
• Dark or cola-colored urine
• Yellowing of the skin or eyes
• Severe fatigue with abdominal pain
• New confusion or major memory change
• Symptoms that start soon after beginning or increasing a statin

Do not stop a statin suddenly without discussing it, especially if you have had a heart attack, stroke, stent, bypass surgery, or very high cholesterol.

Bottom line

Statins are not perfect, but they are among the best-studied medicines in cardiovascular care. True side effects can happen, especially muscle symptoms, mild liver test changes, and small blood sugar increases. Serious harm is rare.

The biggest myth is that every symptom that happens while taking a statin is caused by the statin. The latest trial evidence shows that many reported symptoms occur just as often with placebo.

For the right patient, the benefit is clear: lower LDL, more stable plaque, fewer heart attacks, fewer strokes, and fewer cardiovascular deaths. Statins do not replace lifestyle, but they are a powerful tool for prevention.