Secondary high blood pressure is a result of a specific illness. Usually, once the disease is treated, your blood pressure returns to normal. These signs may indicate you have secondary high blood pressure:
Onset of high blood pressure before age 20 or past age 50
Flushing spells
Rapid pulse
Intolerance to heat
Very high level of blood pressure (over 180/120)
Damage to the eyes, kidneys, or heart
Low level of potassium in the blood
Loud humming sound in the abdomen (called a bruit)
Family history of kidney disease
Poor response to treatment that’s usually effective