Treating the condition that has caused your secondary high blood pressure will not always lower your blood pressure back to a normal level. In this case, you may need to treat the high blood pressure itself.
Treating both your high blood pressure AND the other condition
Your doctor may decide to treat both if it will take a long time to cure the other condition or if your blood pressure is dangerously high. If it takes too long to cure the other condition, the high blood pressure will have more time to damage your system.