What do you call consistently low blood pressure?

The medical term for consistently low blood pressure, when it occurs on a persistent basis, is hypotension. Blood pressure is considered low when the systolic pressure (the top number) is less than 90 mm Hg and the diastolic pressure (the bottom number) is less than 60 mm Hg. Symptoms of hypotension can include dizziness, lightheadedness, fatigue, and fainting. In severe cases, hypotension can lead to shock and even death.