<s>[INST] I am a 30 year old female.  For the past year or so I have been in a birth control pill study and the nurse takes my blood pressure at each appointment.  My blood pressure has been measuring in the pre hypertensive category.  Typically 130s over high 80s.  Every appointment my blood pressure has been taken in the morning.  Today I received my Ozeri blood pressure monitor and my BP read 119/74.  I am baffled as to how it could be normal now after so many months of being high.  Is this normal for BP to be high in the morning and low in the evening?  I am going to test out in the morning to see if its high again. [/INST] Hello, Thanks for the query to Chat Doctor. Forum. Let me explain the things, The normal Blood pressure value is 120/80 mm of Hg. ± 10 mm in upper B P and as age advances this goes up so need not worry. Your 130 B P Is also normal and every time it was normal. The 130 reading was a sensitive reading and this comes due to stress (of B P checking). B P in the evening or morning remains same however fluctuation in upper B P (systolic 10 -20) is absolutely normal and this is not prehypertension stage. Don't be in panic you are normal. Good luck.  </s>