Secondary hypertension

Hypertension is defined as systolic blood pressure ≥ 140 mmHg and/or diastolic blood pressure ≥ 90 mmHg on at least 3 separate occasions without the use of antihypertensive medication. Hypertension can be classified into primary (essential) hypertension and secondary hypertension. Secondary hypertension, also known as symptomatic hypertension, is an elevation in blood pressure caused by certain identifiable diseases or etiologies. When the primary disease is cured, the hypertension, as a secondary symptom, will also decrease or return to normal. Secondary hypertension accounts for 5% to 10% of the hypertensive population, while the majority of hypertensive patients have primary hypertension, which is multifactorial and without a clear single cause.