My blood pressure has always been low. i tested it today and it was 109/47. it has never been that low. should i be concerned and what action should i take?

As : As long as you feel ok, then don't worry about it. High blood pressure is much more worrisome than low. It also matters how you tested it - the electronic machines are notorious for reading the bottom number lower than it really is. If you are feeling dizzy, nauseous, or are having trouble with fainting spells, call your doctor. Otherwise, be glad for your low pressure - it's healthier in the long run.