Low blood pressure, or hypotension, is rarely cause for concern — unless it's extremely low and related to shock. Hypotension is commonly defined as a blood pressure less than 100/60 (pressure between 100/60 and 120/80 is considered optimal). For most people, living with low blood pressure is not an issue. In fact, studies show that the lower your blood pressure, the lower your risk of cardiovascular disease. That said, there are a couple of conditions regarding low blood pressure that I'd like to explain.