Well today after my huge exam, they had a blood donation at my college, so i deceided to give blood, well when they took my blood pressure and said it was low, 82/60 or something like that, i really dont know what that means, and i weigh 135 and im 5'3, and they still allowed me to give blood, question is, is it bad to give when i have low blood pressure, and two how does low blood pressure effect me, i was thinking it was low because i felt a weight lift after my exam, so i wasnt having really any stress after that.