By Reijo Metso High blood pressure, also known as hypertension, is a common problem. Despite being a common problem, very little is known about its causes. Medication can not cure hypertension, only help you to keep your blood pressure under control. But most people can lower their blood pressure by doing a few small changes. Hypertension is a common problem. Despite being a common problem, very little is known about its causes. In fact, in over 90% of all cases the cause is unknown.