Causes of High Blood Pressure In over 90 per cent of cases, the cause is unknown. In the remaining cases, high blood pressure is a symptom of a recognisable underlying problem such as a kidney abnormality, tumour of the adrenal gland or congenital defect of the aorta (in these cases when the root cause is corrected, blood pressure usually returns to norma). This type of high blood pressure is called secondary hypertension.
If high blood pressure isn’t treated and is combined with obesity, smoking, high blood cholesterol levels or diabetes, the risk of heart attack is several times higher. Arteries also suffer the effects of high blood pressure, becoming scarred, hardened and less elastic. Though this hardening of the arteries often occurs with age, high blood pressure accelerates the process. The hardened or narrowed arteries are unable to supply the amount of blood the body’s organs need,