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Medically reviewed by the HealthVetted Medical Board
High cholesterol (hyperlipidemia) means there is too much cholesterol or other fats (lipids) circulating in your blood — most importantly LDL ("bad") cholesterol — which can build up inside artery walls and raise the risk of heart attack and stroke. It almost never causes symptoms on its own, which is why it is found through a simple blood test and managed with lifestyle changes and, when needed, medication.
Cholesterol is a waxy, fat-like substance your body needs to build cell membranes, make hormones, and produce vitamin D and bile acids. Your liver makes all the cholesterol you need; the rest comes from food. Because cholesterol and fats don't dissolve in blood, they travel through the bloodstream packaged inside particles called lipoproteins. The main types measured on a lipid panel are:
"Hyperlipidemia" is the umbrella medical term for elevated lipids in the blood; "dyslipidemia" is a broader term that also includes an abnormally *low* HDL. In everyday use, "high cholesterol" usually refers to elevated LDL or total cholesterol. The relevant ICD-10 codes include E78.0 (pure hypercholesterolemia), E78.1 (pure hyperglyceridemia), E78.2 (mixed hyperlipidemia), and E78.5 (hyperlipidemia, unspecified).
The central concern is not the number itself but what high LDL does over time: it contributes to atherosclerotic cardiovascular disease (ASCVD) — the artery-narrowing process behind most heart attacks, ischemic strokes, and peripheral artery disease. The relationship between LDL and cardiovascular risk is causal and cumulative, meaning lifelong exposure to even modestly elevated LDL adds up (2026 ACC/AHA Dyslipidemia Guideline).
High cholesterol results from a mix of genetics, diet, and lifestyle. Most cases are "primary" (driven by inherited tendencies plus lifestyle), while some are "secondary" to another condition or medication (StatPearls).
Lifestyle and dietary factors:
Medical conditions that can raise lipids (secondary causes):
Genetic and unmodifiable factors:
High cholesterol is common in the U.S. population. Between 2017 and 2020, about 10% of adults age 20 and older had total cholesterol above 240 mg/dL, and roughly 17% had HDL below 40 mg/dL (CDC). Prevalence rises sharply with age.
For the vast majority of people, the honest answer is none. High cholesterol is typically silent — it produces no pain, no obvious sign, and no warning. People can have elevated LDL for years or decades without feeling anything, which is precisely why screening with a blood test matters (CDC).
When problems do appear, they are usually the *consequences* of long-standing high cholesterol rather than the cholesterol itself — for example, chest pain (angina) from narrowed heart arteries, or the sudden symptoms of a heart attack or stroke.
Visible physical signs are uncommon and tend to occur only with very high or genetic forms of hyperlipidemia:
Very high triglycerides (often well above 500 mg/dL) can cause abdominal pain and can trigger acute pancreatitis, a medical emergency.
High cholesterol is diagnosed with a blood test called a lipid panel (or lipid profile), which measures total cholesterol, LDL, HDL, and triglycerides. Many modern panels can be done non-fasting, though your clinician may ask you to fast for 9–12 hours, especially if triglycerides are a concern (2026 ACC/AHA Dyslipidemia Guideline).
These widely used adult thresholds (in mg/dL) help interpret a lipid panel, though they are general categories rather than universal treatment targets:
Modern guidelines emphasize that a single number rarely tells the whole story. Clinicians estimate a person's overall 10-year risk of heart attack and stroke using a validated risk calculator that combines age, sex, blood pressure, smoking, diabetes, kidney function, and cholesterol values. The 2026 ACC/AHA Dyslipidemia Guideline recommends the newer PREVENT equations (for adults 30–79 without prior cardiovascular disease) in place of the older Pooled Cohort Equations, which tended to overestimate risk. The 2026 guideline also returns to explicit LDL goals alongside risk-based treatment — for example, an LDL below about 100 mg/dL for borderline-to-intermediate risk, below 70 mg/dL for high risk, and below 55 mg/dL after a prior heart attack or stroke. In selected people with uncertain risk, a coronary artery calcium (CAC) score — a quick CT scan that detects calcified plaque — can help decide whether medication is warranted, and measuring lipoprotein(a) at least once in adulthood is now also recommended.
General guidance favors checking cholesterol periodically in adults, with more frequent checks as people age or if risk factors are present. Selective screening is also recommended in childhood and adolescence, particularly when there is a family history of very high cholesterol or early heart disease, to catch familial hypercholesterolemia early.
Treatment is built in layers, starting with lifestyle and adding medication based on a person's calculated cardiovascular risk and LDL level — not on the number alone.
For nearly everyone, heart-healthy lifestyle changes are the foundation and continue even if medication is added (2026 ACC/AHA Dyslipidemia Guideline; AHA):
Some non-prescription approaches can help modestly but do not replace prescription therapy for people at meaningful cardiovascular risk:
When lifestyle is not enough or risk is high, several well-established drug classes are used:
Statins are generally well tolerated. Muscle aches are the most commonly reported side effect; serious muscle or liver problems are uncommon, and clinicians can adjust the drug or dose if side effects occur. The decision to start medication is individualized and based on a shared discussion of risk and benefit.
Yes. High cholesterol is one of the most modifiable cardiovascular risk factors, and the same habits that prevent it also keep it controlled over the years (AHA):
Because LDL's effect on arteries is cumulative, starting good habits earlier yields greater lifetime benefit — but it is never too late to lower risk. Notably, slightly more than half of U.S. adults who could benefit from cholesterol-lowering medication are currently taking it (CDC), underscoring how much preventable risk remains on the table.
Most people should have their cholesterol checked routinely as part of preventive care, even without symptoms. See a clinician promptly if you have:
Seek emergency care (call 911) for warning signs of the conditions high cholesterol can cause:
These are emergencies regardless of whether you have a known cholesterol diagnosis.
The outlook for high cholesterol is generally very good when it is identified and managed. Cholesterol itself is highly treatable, and lowering LDL meaningfully reduces the risk of heart attacks and strokes — the more LDL is lowered (within reason), the lower the cardiovascular risk, particularly in higher-risk people (2026 ACC/AHA Dyslipidemia Guideline).
The key determinants of long-term outcome are how high the LDL is, how long it has been elevated, and what other risk factors are present. Untreated, high cholesterol silently advances atherosclerosis and can lead to coronary artery disease, heart attack, stroke, and peripheral artery disease over time. Treated — with lifestyle, appropriate medication, and control of related conditions — most people maintain normal lives and substantially blunt that risk. Familial hypercholesterolemia carries higher inherent risk because exposure begins in childhood, but it too responds well to early, intensive treatment.
Does high cholesterol have symptoms I would notice? Usually not. High cholesterol is typically silent and is found through a blood test, which is exactly why routine screening is recommended even when you feel completely well (CDC).
Can I lower my cholesterol with diet alone, without medication? For some people with mild elevations and low overall risk, diet, exercise, and weight loss can bring cholesterol into a healthy range. For others — especially those with high LDL, diabetes, existing heart disease, or familial hypercholesterolemia — lifestyle alone is often not enough, and medication adds protection that diet cannot match. This is an individual decision best made with a clinician based on your overall risk.
Are eggs and dietary cholesterol the main problem? For most people, saturated and trans fats raise blood LDL more than dietary cholesterol from foods like eggs does. Current guidance focuses on overall eating patterns rather than fixating on a single food, though people with diabetes or established heart disease may be advised to be more cautious.
Do I have to take a statin forever? Statins work only while you take them, and stopping generally allows cholesterol — and risk — to return. Many people take them long-term, but the right plan depends on your risk and how your numbers respond; never stop a prescribed medication without talking to your clinician.
Is "good" HDL cholesterol something I can raise? Exercise, quitting smoking, losing excess weight, and limiting alcohol can modestly raise HDL. However, simply pushing HDL numbers up with medication has not reliably reduced heart risk, so current treatment focuses primarily on lowering LDL.
Usually not. High cholesterol is a 'silent' condition that typically causes no symptoms on its own. Many people only discover it through a routine blood test or after a complication like a heart attack or stroke. In rare inherited cases, you may see cholesterol deposits on the skin, eyelids, or as a ring around the eye. Because it is silent, periodic screening is the only reliable way to know your levels.
LDL is often called 'bad' cholesterol because high levels deposit in artery walls and form plaque, narrowing arteries and raising heart attack and stroke risk. HDL is the 'good' cholesterol because it helps carry cholesterol back to the liver to be removed. In general, lower LDL and higher HDL are healthier. A lipid panel reports both, plus triglycerides and total cholesterol, so your clinician can assess your overall risk.
Most high cholesterol comes from a mix of genetics and lifestyle. Diets high in saturated and trans fats, physical inactivity, excess weight, smoking, and heavy alcohol use can raise it. Family history matters too; familial hypercholesterolemia causes very high cholesterol from birth. Some cases are secondary to conditions like hypothyroidism, diabetes, or kidney disease, or to certain medications. Your clinician can help identify which factors apply to you.
It is diagnosed with a blood test called a lipid panel, which measures total cholesterol, LDL, HDL, and triglycerides. Some versions require fasting for 9 to 12 hours first. Because high cholesterol has no symptoms, screening is key. An abnormal result is often repeated to confirm. Your clinician interprets the numbers alongside other risk factors, such as age, blood pressure, smoking, and diabetes, rather than treating a single value in isolation.
Many people can improve their cholesterol with lifestyle changes alone, especially if their overall heart risk is low. Helpful steps include eating more fiber, vegetables, and fish while limiting saturated and trans fats, exercising regularly, reaching a healthy weight, quitting smoking, and limiting alcohol. However, some people, particularly those with high risk or inherited high cholesterol, still need medication. Work with your clinician to decide what is right for you.
Screening intervals depend on your age and risk. Many adults are checked every few years, with more frequent testing if you have diabetes, obesity, high blood pressure, a family history of early heart disease, or familial hypercholesterolemia. Children with strong family history may be screened earlier. Your clinician will recommend a schedule based on your numbers and overall cardiovascular risk, so follow their personalized advice rather than a one-size-fits-all rule.
This page is for general information and is not medical advice. Always consult a qualified clinician about diagnosis and treatment. Individual results vary.