Dear doctor , many times i checked my BP ,from childhood i have low BP, Most of the time my BP is 100/70 ,not gone more then this , recently i walked to hospital just to check my BP , nurse checked my BP from my right hand an it was 130/80, which was shocking , then i wanted to rest for some time so that i can recheck again , it was 120/80, after coming home i check my BP in my smart watch which showed 102/74...Is hospital BP checking machine was wrong ya my BP is gone up ??? pls tell me ,