Signs of high blood pressure are what your doctor looks for, according to this site. See both signs and symptoms here, but you're unlikely to experience symptoms.

Signs of high blood pressure, or symptoms, may occur when damage has already occurred or is occurring to vital organs.

This brief video says there may be some symptoms, but most people never have any warning signs of high blood pressure.

Here's more of what can happen if you wait for signs of high blood pressure, rather than getting tested and doing something about it if you have it.

This article too says that hypertension is called the silent killer because most people have no sign of high blood pressure symptoms before it kills them.

Waiting for a sign of high blood pressure without getting tested is a huge mistake because you may never experience any symptoms at all -- or not until it's critical.