How do I know if I have this — when it refuses to announce itself?
It doesn't announce itself — that is the entire clinical problem. Hypertension produces no reliable symptoms at any level below crisis. Headaches are a persistent myth: population studies find no link between routine high pressure and headache. The only dependable way this condition is ever found is a cuff — which makes this chapter a measurement chapter: who measures, how, when to suspect a hidden secondary cause, and what a true crisis looks like.
Pressure rises slowly over years; the body's sensors recalibrate around it. There is no pain fiber in an artery wall waiting to alert you.
CommonA cuff reading is the only presentation this condition has — which is why every pharmacy machine and annual physical matters.
CommonRoutine high blood pressure does not cause headaches — studies show no association. Exception: severe morning headache with vision changes belongs to crisis territory.
CommonFor the uncontrolled, the first 'symptom' is too often the stroke, the heart attack, or the heart failure admission — the outcome arriving as the diagnosis.
CommonTwo measurement phenomena matter. White-coat hypertension — office readings running high while home readings run normal — is real stress physiology, common enough that diagnosis should never rest on office readings alone. Masked hypertension — the mirror image — is the more dangerous one: normal in the clinic, elevated at home, and fully invisible to office-only screening. The answer to both is the same: properly performed home monitoring across a week, shared with your physician.
Some patterns justify a deliberate search for a secondary cause: onset before 30 or after sudden change, hypertension resistant to three medications, or lab clues like low potassium. The search list is short and high-yield — sleep apnea (the most common hidden driver of resistant hypertension, and per the sleep-apnea page, one you cannot feel yourself having), primary aldosteronism (an overproducing adrenal gland — far more common than historically believed), renal artery stenosis, thyroid disease, and medication culprits (NSAIDs, pseudoephedrine decongestants, corticosteroids, oral contraceptives, and licorice).
Select a trigger
Hypertension risk factors cluster into four families. Knowing yours shapes the screening conversation:
Readings of 180/120 or higher are a crisis. Call 911 if the high reading comes with any of these: