There is a lot of talk about the dangers of uncontrolled high blood pressure, or hypertension, but untreated unusually low blood pressure, or hypotension, can be just as dangerous. Contrary to high blood pressure symptoms, which are vague and often completely absent, low blood pressure symptoms are frequently more obvious and recognizable. The emergence of symptoms is frequently an early indicator of a condition with potentially significant underpinnings. In general, symptoms wouldn't appear until your blood pressure has dropped significantly.