How do I know if I have this — and why does it never announce itself?
It doesn't. That is the defining feature of this condition: high cholesterol produces no symptoms whatsoever. You cannot feel your LDL. There are no early warning sensations, no fatigue, no ache — only a blood test can find it, and the disease it feeds (atherosclerosis) stays silent for decades while it grows. The 'symptom' chapter of this page is therefore really a screening chapter: who should be tested, when, and what the rare visible signs of extreme levels look like.
A lipid panel is the only way high cholesterol is ever found — routine bloodwork is the entire early-detection system.
CommonFor too many people, the first manifestation of untreated high cholesterol is a heart attack or stroke — decades of silent deposition, presenting all at once.
CommonHeart attacks before 55 in fathers or 65 in mothers, or any family member with LDL 190+, points toward inherited FH — roughly 1 in 250 people.
CommonTendon xanthomas (cholesterol deposits in Achilles tendons and knuckles) and corneal arcus in the young are classic FH markers — rare, but unmistakable.
CommonGuidelines recommend a lipid panel for every adult every 4–6 years, with children screened once between ages 9–11 — and much earlier and more aggressively in FH families, where cascade testing of relatives is standard practice after one diagnosis. The goal is not a number for its own sake; it's a risk conversation: your LDL is read alongside age, blood pressure, smoking, and diabetes to compute a 10-year cardiovascular risk that determines whether — and how hard — to treat.
One under-checked cause deserves its own line: hypothyroidism. Thyroid hormone sets how many LDL receptors your liver maintains; a sluggish thyroid quietly raises LDL. New, unexplained high LDL warrants a TSH check — sometimes treating the thyroid corrects the cholesterol, and no lipid medication is needed. Similarly, kidney disease, some diuretics, and untreated diabetes (via triglycerides) all reshape the panel. The first question after an abnormal result is always why — not just how much.
Select a trigger
High cholesterol risk factors cluster into four families. Knowing yours shapes the conversation:
This is what decades of untreated high cholesterol can become. Call 911 immediately if you experience: