Lifestyle

5 Signs Your Cholesterol Is High Without Knowing It

By Curtis Jones · July 18, 2026

High cholesterol has a well-earned nickname in cardiology: the silent killer. It earned it because the condition produces essentially no noticeable symptoms in the vast majority of people who have it — until it has already done serious damage.

About 40% of American adults have high cholesterol and are unaware of it, according to a study published in JAMA Cardiology cited by the American College of Cardiology. The National Heart, Lung, and Blood Institute confirms that most people with high cholesterol feel completely normal — the buildup of plaque inside arterial walls typically produces no pain, no warning, and no obvious signal until a heart attack or stroke occurs. That’s what makes the condition so dangerous: by the time the body signals that something is wrong, the underlying disease has often been progressing silently for years.

Here’s what to watch for — and why even these signs are easy to miss.

Yellowish bumps near the eyes or on the joints. These are called xanthomas, and they’re one of the few physical signs that high cholesterol can produce. Small, yellowish-white deposits — sometimes described as looking like tiny pimples — can appear on the eyelids, knees, elbows, or Achilles tendons. Most people mistake them for cysts or skin conditions and never connect them to cholesterol. They tend to appear when cholesterol levels are severely elevated, particularly in people with a genetic condition called familial hypercholesterolemia.

A grayish-white ring around the cornea. Known as corneal arcus, this is a circular arc of grayish or white material that develops at the outer edge of the cornea. In people over 60, it’s often considered a normal age-related change and is typically benign. But in people under 45, corneal arcus is associated with significantly elevated cholesterol levels and is worth bringing to a doctor’s attention.

Pain or cramping in the legs during walking. This symptom doesn’t come from cholesterol itself — it comes from what cholesterol does over time. As plaque builds up inside arterial walls, it narrows the vessels that deliver blood to the legs. The resulting condition, peripheral artery disease, causes pain, cramping, or heaviness in the calves or thighs that typically comes on during walking and eases with rest. “Know your numbers,” says Dr. Seth Martin, a preventive cardiologist at Johns Hopkins Medicine. “Very high levels of cholesterol can cause cholesterol buildup in the eyes and tendons that are detectable on a physical exam. However, most people don’t have these.”

Chest tightness or shortness of breath during exertion. Like the leg cramping above, this is a downstream symptom — what happens when high cholesterol has been narrowing the arteries that supply the heart with blood. Angina, or chest pain triggered by physical activity or stress, is the body’s signal that the heart muscle isn’t getting enough oxygen. If it appears during exercise and eases at rest, that pattern warrants immediate medical attention.

A family history of early heart disease — even without any symptoms at all. Familial hypercholesterolemia, an inherited condition that causes dangerously elevated LDL cholesterol from birth, affects roughly 1 in 250 people and often goes undiagnosed for decades. The American College of Cardiology notes that people with this condition face significantly elevated risk of heart attack or stroke, often with no warning. If a parent, sibling, or grandparent had a heart attack before age 55 (men) or 65 (women), ask your doctor specifically about a cholesterol screening and a lipoprotein(a) test.

For the vast majority of people, high cholesterol will produce none of these physical signs. The condition will be entirely invisible until a routine blood draw catches it — or until it isn’t. A standard lipid panel takes minutes and is typically covered by insurance as part of preventive care. The American Heart Association recommends adults have their cholesterol checked starting at age 20 and every four to six years thereafter, more frequently if risk factors are present.

The fact that it feels like nothing is exactly the problem.