A low blood pressure reading is having a level that is 90/60mmHg, or lower.
Only one of the numbers has to be lower than it should be to count as low blood pressure. In other words:
if the top number is 90 or less (regardless of the botton number) this may be low blood pressure
if the bottom number is 60 or less (regardless of the top number) this may be low blood pressure
Some people have a blood pressure level that is naturally low. That is, there is no specific cause or reason why. However, some health conditions or medicines can cause you to develop low blood pressure. With HIGH blood pressure that puts you at risk of major Cardiovascular complications, not recommended.
Usually, having low blood pressure is not a cause for concern. However, sometimes your blood pressure can drop to a point where you may feel faint or dizzy. If you find that your blood pressure is suddenly much lower than usual, there may be a reason for this.
Speak to your doctor or nurse.