there is high blood presser but what i need to know is can someone have low blood presser.? i was donating plasma and had my blood presser taken we thought it had to be wrong, they took it three times. two times it was very low. but i started to get upset and it went up. i have bad headaches that i have seen doctors for and was thinking maybe my blood presser could be the problem i don t donate plasma i only did that two times and they told me i can t ever donate again.