@Setanta,
I never really asked, but my doctor had said I have that my blood pressure is low - I noted that once because one time after they took my blood pressure the nurse was alarmed - your rate is very high. I guess I probably hurried to my appointment because I was late - I pretty much ran as my office was walking distance to the doctor.
They let me rest for a bit and then it went to what is "normal" for me. I don't eat much salt at all and drink lots of water. I was wondering because this was taken at the dentist (I have some minor surgery with the dentist so he took my pressure and I peeked at the computer and thought - that seems low).