High cholesterol has no symptoms. You cannot feel it, and there are no reliable warning signs in daily life. A simple blood test called a lipid panel is the only way to know your levels. This is why cholesterol is often called a “silent” condition: it can quietly damage your arteries for years before causing a heart attack or stroke.
Why You Can’t Feel High Cholesterol
When there’s too much LDL (“bad”) cholesterol circulating in your blood, it gradually builds up on the walls of your arteries. This buildup, called plaque, narrows the arteries over time and restricts blood flow. The process can begin as early as your teens and progress for decades without producing any noticeable sensation. By the time symptoms do appear, they usually take the form of a serious cardiovascular event like chest pain, a heart attack, or a stroke.
Think of it like rust forming inside a pipe. The pipe still works fine for a long time, but the opening keeps getting smaller. Eventually, it can clog completely or a chunk of buildup can break loose and block flow downstream. That’s essentially what happens when a plaque ruptures and triggers a blood clot in an artery feeding your heart or brain.
Rare Physical Signs of Very High Cholesterol
In a small number of people with severely elevated cholesterol, the body does produce visible clues. The most common is xanthelasma: yellowish, flat or slightly raised patches that appear on or near the eyelids, typically near the corners closest to your nose. These are actual cholesterol deposits under the skin. They’re painless and harmless on their own, but they signal that lipid levels may be significantly elevated.
Another sign is a grayish-white ring around the colored part of the eye, called corneal arcus. In people under 45, this ring can suggest a lipid disorder. In older adults, it’s more common and less meaningful on its own. Some people also develop cholesterol deposits (xanthomas) on tendons, especially the Achilles tendon or the tendons on the backs of the hands. These signs are most often associated with familial hypercholesterolemia, an inherited condition that causes very high cholesterol from birth. Most people with high cholesterol will never see any of these signs.
The Blood Test That Tells You
A lipid panel is a routine blood draw that measures four key numbers:
- Total cholesterol: the overall amount of cholesterol in your blood
- LDL cholesterol: the type that builds up in artery walls
- HDL cholesterol: the type that absorbs excess cholesterol and carries it back to the liver for removal
- Triglycerides: another type of fat in your blood, elevated by excess calories, sugar, and alcohol
Your report may also include non-HDL cholesterol, which is simply your total cholesterol minus your HDL. This number captures all the cholesterol types that contribute to plaque and gives a broader picture than LDL alone.
What the Numbers Mean
For most adults, optimal total cholesterol is around 150 mg/dL and optimal LDL is around 100 mg/dL. A total cholesterol above 200 mg/dL is generally considered high for both adults and children.
Triglycerides have their own scale. Normal is below 150 mg/dL. Borderline high falls between 150 and 199, high ranges from 200 to 499, and anything at or above 500 mg/dL is considered very high and carries a risk of pancreatitis on top of heart disease. Levels above 150 mg/dL also count as a risk factor for metabolic syndrome.
HDL works in the opposite direction from the others. Higher is better, because HDL carries cholesterol out of your arteries and back to the liver for disposal. An HDL level below 40 mg/dL is considered low and increases cardiovascular risk.
Keep in mind that your numbers don’t exist in isolation. Your overall cardiovascular risk depends on cholesterol levels combined with your age, blood pressure, smoking status, and whether you have diabetes. Doctors use a risk calculator that weighs all of these factors together to determine how aggressively to treat elevated cholesterol.
Do You Need to Fast Before the Test?
Fasting before a lipid panel used to be standard advice, but guidelines have shifted. A joint consensus from the European Atherosclerosis Society and the European Federation of Clinical Chemistry found that fasting is not routinely required. Non-fasting lipid profiles are accurate enough for most screening purposes and make it easier for people to actually get tested, since you can have blood drawn at any appointment without planning ahead.
Fasting may still be recommended if your non-fasting triglycerides come back above 440 mg/dL, because eating can temporarily raise triglyceride levels enough to affect interpretation. If your doctor orders a fasting panel, you’ll typically need to avoid food and drinks other than water for 9 to 12 hours beforehand.
When and How Often to Get Tested
Cholesterol screening starts earlier than most people expect. Children should have their cholesterol checked at least once between ages 9 and 11, and again between ages 17 and 21. For healthy adults with no known risk factors, testing every 4 to 6 years is the standard recommendation.
You’ll need more frequent testing if you have heart disease, diabetes, or a family history of high cholesterol. The same applies to children who have obesity or diabetes. If you’ve never had your cholesterol checked as an adult, or if it’s been more than six years, getting a lipid panel is a straightforward first step. It’s a standard blood draw that most primary care offices can order during a routine visit, and results typically come back within a day or two.
Why Early Detection Matters
Atherosclerosis, the process of plaque accumulating in your arteries, follows what researchers call a “cumulative damage hypothesis.” The damage adds up over time, starting younger than most people realize. Studies using ultrasound imaging have found signs of coronary atherosclerosis in asymptomatic teenagers and young adults. The longer cholesterol stays elevated, the more plaque accumulates and the harder it becomes to reverse.
This is precisely why the condition’s silent nature makes it dangerous. People who feel perfectly healthy may assume nothing is wrong, while plaque steadily narrows their arteries over years or decades. A single lipid panel can catch the problem long before it reaches a critical stage, giving you time to make changes through diet, exercise, or medication that meaningfully reduce your risk of heart attack and stroke.