High Cholesterol: Causes, Risks, and How to Lower It

An estimated 86 million American adults — roughly two in five — have total cholesterol at or above 200 mg/dL, and about 1 in 10 have levels of 240 mg/dL or higher, yet high cholesterol produces no symptoms whatsoever until it causes a heart attack or stroke. According to the CDC, high cholesterol is one of the most significant — and most treatable — risk factors for cardiovascular disease, which remains the leading cause of death in the United States. Understanding your cholesterol numbers and knowing what to do about them could add years to your life. For a broader view of common health conditions, see our medical conditions guide.

What Is Cholesterol?

Cholesterol is a waxy, fat-like substance found in every cell of your body. Despite its bad reputation, cholesterol is essential for life — your body needs it to build cell membranes, produce hormones (including estrogen, testosterone, and cortisol), make vitamin D, and create bile acids that help digest fat. Your liver produces all the cholesterol your body needs. The problem arises when excess cholesterol — driven by a combination of genetics, diet, and other health conditions — accumulates in your bloodstream.

Cholesterol travels through your blood in particles called lipoproteins. The two most talked-about types are low-density lipoprotein (LDL) and high-density lipoprotein (HDL). LDL carries cholesterol from the liver to cells throughout the body. When there’s too much LDL, the excess deposits in artery walls, forming plaque — the basis of atherosclerosis. HDL does the opposite: it helps collect cholesterol from artery walls and carry it back to the liver for disposal. Because of this, LDL is often called “bad” cholesterol and HDL “good” cholesterol, though the biology is more nuanced than those labels suggest.

Triglycerides, another type of blood fat, are also measured as part of a standard lipid panel. High triglycerides — often driven by excess sugar, refined carbohydrates, alcohol, and insulin resistance — independently contribute to cardiovascular risk. The NHLBI emphasizes that understanding all components of your lipid panel, not just total cholesterol, is important for assessing your cardiovascular risk. Many clinicians now also pay attention to non-HDL cholesterol (total cholesterol minus HDL) and apolipoprotein B (apoB), which count all the cholesterol-carrying particles that can drive plaque.

Understanding Your Numbers

A standard lipid panel reports four key values. Here are the general reference ranges for adults, though your doctor may set different goals based on your individual risk profile:

• Total cholesterol: Desirable is below 200 mg/dL. Borderline high is 200–239. High is 240 and above.
• LDL cholesterol (“bad cholesterol”): Optimal is below 100 mg/dL. Near optimal is 100–129. Borderline high is 130–159. High is 160–189. Very high is 190 and above.
• HDL cholesterol (“good cholesterol”): Higher is generally better. Below 40 mg/dL for men and below 50 for women is considered a risk factor. 60 and above has traditionally been viewed as protective.
• Triglycerides: Normal is below 150 mg/dL. Borderline high is 150–199. High is 200–499. Very high is 500 and above.

Two important caveats have emerged in recent years. First, there is no single “one-size-fits-all” LDL target — the right goal depends on your overall cardiovascular risk. For people with established cardiovascular disease or diabetes, clinicians often aim for LDL below 70 mg/dL, and current guidance supports pushing LDL below 55 mg/dL in very high-risk patients. Second, “higher HDL is always better” is an oversimplification — very high HDL does not appear to add protection, and raising HDL with drugs has not reduced heart attacks in trials.

The Mayo Clinic notes that adults should generally begin cholesterol screening in early adulthood (often around age 20), with repeat testing every four to six years for low-risk individuals and more frequently for those with risk factors. When your risk is uncertain, a clinician may order additional tests — such as a coronary artery calcium (CAC) score, high-sensitivity CRP, or lipoprotein(a) — to sharpen the picture before deciding on treatment.

Causes of High Cholesterol

High cholesterol results from an interplay of genetics, diet, lifestyle, and other health conditions. Diets high in saturated fat (found in red meat, full-fat dairy, and tropical oils) and trans fats (found in some processed and fried foods) tend to raise LDL cholesterol. Excess body weight, particularly abdominal fat, tends to raise LDL and triglycerides while lowering HDL. Physical inactivity has a similar effect.

Genetics play a substantial role. Familial hypercholesterolemia (FH) is a genetic condition affecting roughly 1 in 250 people that causes very high LDL levels from birth. People with FH can have LDL levels of 190 mg/dL or higher and are at dramatically elevated risk for premature heart disease. The CDC and FH advocacy groups estimate that most people with FH remain undiagnosed — meaning many are not receiving the earlier, more intensive treatment they need. If you have a personal or family history of very high cholesterol or heart attacks before age 55 (men) or 65 (women), tell your clinician; FH is one situation where treatment is genuinely urgent.

Several medical conditions contribute to high cholesterol, including hypothyroidism, chronic kidney disease, diabetes, and liver disease. Certain medications — including some diuretics, beta-blockers, corticosteroids, and immunosuppressants — can also raise cholesterol levels. Age and sex matter too: cholesterol levels tend to rise with age, and women’s LDL often increases after menopause.

Health Risks of High Cholesterol

The primary danger of high cholesterol is atherosclerosis — the buildup of plaque in artery walls throughout the body. In the coronary arteries, this leads to coronary artery disease, angina, and heart attacks. In the carotid arteries (supplying the brain), it increases the risk of stroke. In the peripheral arteries (supplying the legs and arms), it causes peripheral artery disease.

Atherosclerosis is a slow, progressive process that begins early in life and develops over decades. For much of this time, there are no symptoms — the first sign may be a heart attack or stroke. This is why high cholesterol is sometimes called a “silent” condition. According to the American Heart Association, high cholesterol substantially increases your risk of heart disease, and the risk compounds when it is combined with high blood pressure, diabetes, or smoking.

Very high triglycerides (above 500 mg/dL, and especially above 1,000 mg/dL) carry an additional risk: acute pancreatitis, a painful and potentially dangerous inflammation of the pancreas. This is a separate concern from atherosclerosis and requires specific treatment to bring triglyceride levels down.

Lipoprotein(a): The Inherited Risk Factor Many People Have Never Heard Of

Lipoprotein(a), written Lp(a) and spoken “L-P-little-a,” is an LDL-like particle whose level is set almost entirely by your genes. Roughly 1 in 5 people worldwide carries an elevated Lp(a), and high levels independently raise the risk of heart attack, stroke, and narrowing of the aortic valve — even in people whose standard LDL looks fine. Because it is genetically determined, most experts suggest measuring Lp(a) at least once in a lifetime, particularly if you have a strong family history of early heart disease or your cardiovascular risk is otherwise unclear.

Diet and exercise do not meaningfully lower Lp(a). As of early 2026, no medication is specifically approved to lower it, though several targeted therapies are in advanced clinical trials, and results are eagerly awaited. In the meantime, the practical response to a high Lp(a) is to control every other risk factor aggressively — LDL, blood pressure, blood sugar, weight, and smoking. If your Lp(a) is elevated, discuss what it means for you with a clinician rather than acting on a single number.

Lowering Cholesterol Through Diet

Dietary changes can lower LDL cholesterol by roughly 10–30% depending on the degree of change and your starting point. The most impactful dietary modifications include reducing saturated fat, eliminating trans fats, increasing soluble fiber intake (found in oats, beans, lentils, apples, and citrus fruits), and adding plant sterols and stanols (found in some fortified foods). The American Heart Association suggests limiting saturated fat to a small share of daily calories for people who need to lower LDL.

The Mediterranean diet — rich in olive oil, fish, nuts, whole grains, fruits, and vegetables — has particularly strong evidence for improving lipid profiles and reducing cardiovascular events. Landmark research on Mediterranean-style eating patterns has shown meaningful reductions in major cardiovascular events compared with lower-fat control diets. Dietary patterns, rather than any single “superfood,” are what move the needle.

Omega-3 fatty acids from fatty fish (salmon, mackerel, sardines) can lower triglycerides. Nuts (particularly almonds and walnuts) have been shown to lower LDL cholesterol modestly, and soy protein may help a little. The NHLBI recommends the DASH or Therapeutic Lifestyle Changes (TLC) eating plans as structured, evidence-based approaches to cholesterol-lowering nutrition.

Exercise and Weight Management

Regular physical activity improves your cholesterol profile in several ways. It raises HDL cholesterol — one of the few interventions that reliably does so. Exercise also lowers triglycerides, may modestly reduce LDL, and shifts LDL particles from the small, dense type (more atherogenic) toward the large, buoyant type. The benefit comes from consistency rather than intensity: current activity guidance suggests at least 150 minutes of moderate activity per week, and even brisk walking for 30 minutes most days produces meaningful improvements.

Weight loss amplifies these benefits. Losing just 5–10% of your body weight can lower LDL and triglycerides and raise HDL. For someone weighing 200 pounds, that’s a loss of 10–20 pounds. According to the American Heart Association, maintaining a healthy weight is one of the most effective strategies for long-term cardiovascular and cholesterol management.

Quitting smoking also improves your lipid profile and, more importantly, cuts overall cardiovascular risk sharply. Smokers tend to have lower HDL levels, and HDL typically increases within weeks to months of quitting. Alcohol has a complex relationship with cholesterol: moderate consumption can raise HDL, but excessive drinking raises triglycerides and carries other health risks that outweigh any potential benefit. Current public-health guidance leans toward “less is better,” and no one should start drinking for heart health.

Cholesterol-Lowering Medications

Medications enter the picture when lifestyle changes are not enough, or when your risk is high enough that waiting is not wise. The goal of drug therapy is not simply to make a lab number look better — it is to lower your risk of heart attack, stroke, and cardiovascular death. All of the medications below are prescribed and monitored by a clinician; the descriptions here are general and intentionally omit specific doses.

Statins

Statins are the first-line medication for high cholesterol and have the strongest evidence base of any cholesterol drug. They work by blocking an enzyme in the liver that produces cholesterol, which can reduce LDL substantially depending on the specific statin and dose. Commonly prescribed statins include atorvastatin (Lipitor), rosuvastatin (Crestor), and simvastatin (Zocor), all available as inexpensive generics.

Beyond lowering LDL, statins stabilize arterial plaques, reduce inflammation, and have been shown in numerous large clinical trials to reduce heart attacks, strokes, and cardiovascular death. The Mayo Clinic notes that the most commonly reported side effect is muscle aching, though rigorous studies suggest true statin-caused muscle symptoms are less common than often assumed. Most people tolerate statins well, and for those who need them the cardiovascular benefits far outweigh the risks.

Do not stop a statin on your own. Stopping abruptly — because you feel fine, read something alarming online, or want to “take a break” — can allow your risk to climb back up. If you have side effects or concerns, talk to your prescriber. Often the answer is a different statin, a lower dose, or a different schedule rather than abandoning treatment altogether.

Other Medications

When statins aren’t enough or can’t be tolerated, several other options exist, and the menu has grown in recent years:

• Ezetimibe (Zetia) blocks cholesterol absorption in the intestine and can lower LDL further when added to a statin. It is oral, inexpensive as a generic, and well tolerated.
• PCSK9 inhibitors (evolocumab/Repatha and alirocumab/Praluent) are injectable antibodies that can lower LDL dramatically, even on top of a statin — particularly useful for familial hypercholesterolemia or very high cardiovascular risk. They are given as a self-injection every few weeks.
• Bempedoic acid (Nexletol, and combined with ezetimibe as Nexlizet) is an oral medication that works upstream of statins and does not concentrate in muscle, so it may cause fewer muscle-related complaints. In the CLEAR Outcomes trial, bempedoic acid reduced cardiovascular events in statin-intolerant patients, and its FDA label was subsequently expanded to include cardiovascular risk reduction.
• Inclisiran (Leqvio) is a newer small-interfering-RNA (siRNA) therapy that lowers LDL by reducing PCSK9 production in the liver. A key practical advantage is dosing: after the first couple of injections, it is given only about twice a year in a clinician’s office, which can help with adherence.
• Fibrates primarily lower triglycerides and modestly raise HDL.
• Prescription omega-3 (icosapent ethyl/Vascepa) has shown cardiovascular benefit in selected people with high triglycerides who are already on a statin.
• Niacin and bile acid sequestrants are older options used less often today because of side effects or limited outcome benefit.

The 2018 ACC/AHA cholesterol guideline and the 2022 ACC Expert Consensus Decision Pathway on non-statin therapies describe a stepwise approach: maximize a statin first, then add ezetimibe, then consider a PCSK9 inhibitor, bempedoic acid, or inclisiran if the LDL goal still isn’t met. Because newer agents like PCSK9 inhibitors and inclisiran carry significantly higher price tags than generic statins, understanding healthcare costs and coverage is a real part of the decision — ask about copay assistance and prior-authorization requirements.

Special Populations

Children with familial hypercholesterolemia may need cholesterol-lowering treatment starting in childhood. Guidelines from pediatric groups support universal lipid screening once between ages 9–11 and again in the late teens, and statins are approved for children with FH from around ages 8–10. Early identification matters most in families with known FH.

Older adults require individualized consideration. The benefits of starting a statin purely for prevention in people over 75 without established cardiovascular disease are less certain, and decisions should weigh potential benefits against medication burden and other health conditions. For older adults with known cardiovascular disease, statin therapy generally remains beneficial regardless of age.

Women have historically been underrepresented in cholesterol research, but current guidelines apply the same LDL targets and treatment thresholds to both sexes. Pregnancy requires special consideration — most lipid-lowering drugs, including statins, are generally avoided during pregnancy and breastfeeding, so anyone who is pregnant, planning pregnancy, or nursing should review their medications with their clinician.

Frequently Asked Questions

How often should I get my cholesterol checked?

Most adults at low cardiovascular risk can have a lipid panel every four to six years. If you have risk factors — high blood pressure, diabetes, smoking, family history of early heart disease, or obesity — more frequent testing is appropriate. People on cholesterol-lowering medications are typically rechecked within a few months of starting or changing treatment and periodically thereafter.

Can high cholesterol be reversed?

High cholesterol levels can absolutely be reduced through diet, exercise, weight loss, and medications. Whether existing arterial plaque can be reversed is more nuanced — aggressive LDL lowering has been shown to modestly reduce plaque volume in imaging studies and, more importantly, to stabilize plaques so they are less likely to rupture and cause a heart attack.

Are eggs bad for cholesterol?

The relationship between dietary cholesterol and blood cholesterol is more complex than once believed. For most people, moderate egg consumption does not significantly raise LDL or cardiovascular risk. Saturated and trans fats in your overall diet have a much larger impact on blood cholesterol than dietary cholesterol itself. As with most nutrition questions, the overall pattern matters more than any single food.

Do I need to fast before a cholesterol test?

Traditional guidelines recommended a 9–12 hour fast, primarily for accurate triglyceride measurement. Updated guidance accepts non-fasting lipid panels for most screening purposes. Your doctor may still request a fasting test if your non-fasting triglycerides are elevated or for certain follow-up monitoring.

What are the side effects of statins?

The most commonly reported side effect is muscle aching or weakness. Serious muscle damage (rhabdomyolysis) is very rare. Other potential effects include modest, usually reversible liver enzyme elevation and a slightly increased risk of developing type 2 diabetes in people already predisposed. For the great majority of people who need them, the cardiovascular benefits outweigh these risks — and side effects should be discussed with your prescriber rather than being a reason to quit on your own.

My cholesterol is only a little high. Is that urgent?

Usually a mildly elevated number is a prompt to improve diet, activity, and weight and to recheck — not an emergency. But some situations warrant faster, more aggressive action: familial hypercholesterolemia, LDL of 190 mg/dL or higher, existing cardiovascular disease, diabetes with other risk factors, or a strong family history of early heart attacks. If any of those apply to you, don’t wait — talk to a clinician promptly.

Taking Action on Your Cholesterol

High cholesterol is a problem you can do something about. Start by knowing your numbers — if you haven’t had a lipid panel in the last few years, schedule one. If your numbers are elevated, work with your doctor to weigh your overall risk and decide whether lifestyle changes alone are sufficient or whether medication is warranted. Don’t dismiss high cholesterol because you feel fine — the absence of symptoms is precisely what makes it so dangerous.

Make dietary changes you can sustain: swap saturated fats for healthy fats, eat more fiber, add fatty fish to your weekly meals, and watch portion sizes. Move your body regularly. If your doctor prescribes a statin or another medication, take it as directed, and raise any concerns at your next visit instead of stopping on your own. Small, consistent actions today prevent catastrophic events tomorrow.

Sources

• Centers for Disease Control and Prevention (CDC) — Cholesterol
• National Heart, Lung, and Blood Institute (NHLBI) — Blood Cholesterol
• Mayo Clinic — Cholesterol Test
• American Heart Association — About Cholesterol
• 2018 ACC/AHA Guideline on the Management of Blood Cholesterol
• 2022 ACC Expert Consensus Decision Pathway on Non-Statin Therapies for LDL-C Lowering
• MedlinePlus — Cholesterol