How are you sure that it is low BP? A BP of 90/70mmHg to 140/90mmHg is considered normal for people. But what is normal to some isn't normal to others. This number, say a BP of 110/70mmHg can be within the normal value, but one may experience signs & symptoms of a hypotension or low BP, while for some, this value is considered high. There are things to be considered for you to be considered hypo or hypertensive. The best thing to do is consult a doctor, a physician for that. And according to the cause of the problem, you could have the best treatment. Good luck.