Introduction: In most cases of high blood pressure (hypertension), there is no known cause. About 6% of the time, however, high blood pressure is caused by another condition or disease. When this happens, it is called secondary hypertension. Most of the conditions that cause secondary hypertension involve the overproduction of one of the body's hormones. High blood pressure may be a side effect of medication, such as hormonal contraceptives and non-steroidal anti-inflammatory agents.
Symptoms: The traditional definition of high blood pressure is a systolic blood pressure (the higher of the two blood pressure numbers) is 140 millimeters of mercury (mm Hg) or above, and the diastolic blood pressure (the lower blood pressure number) is 90 mm Hg or above. People with secondary hypertension often have blood pressure that is more difficult to control with one or two medications. Also, there can be other symptoms related to the medical illness that is causing the hypertension.
Statistics: In Norway according to General prevalence for Secondary hypertension in men is 1.2 percent and 1.9 in women and prevalence according to age 18-24 years is 1.8 percent and aged 25-44 years is 1.8percent.