Hypotension is the medical term for low blood pressure, generally considered to be a systolic blood pressure of 90 mm Hg or less in an adult.

However, some normal adults may have levels that low without any symptoms, while some hypertensive patients may develop shock with what would be considered normal blood pressure.

Blood pressures vary, depending on such factors as age, race, sex, and environment. On rare occasions, individuals may have medical problems that cause low blood pressure. Among...