What causes diastolic blood pressure to drop (and systolic to rise)?

For past 3 weeks my blood pressure has been 135/60 - 140/70 and it used to be 120/80 last month. What may be the likely cause for the drop in diastolic and rise in systolic?

i am getting worried. I am only 27. I tried to dismiss as anxiety but the reading is pretty consistent. I heard that secondary hypertension will increase your systolic pressure sharply.

I have no risk factor for blocked artery.

thanks

[Melvine]

would appreciate any advise. thanks!

[checkmatedrive]

I will be interested in the answers to your question.  I have had the same shift.  My pulse also used to be very  high.  Now it is in the 50's and 60's.  When it is in the 80's I feel like I used to when it was 110.  checkmatedrive

[kenkeith]

Primary hypertension is usually ideopathic (cause unknown), secondary hypertension is the result or secondary to another condition i.e. kidney dysfunction, casrdio/vascular disorder almost always due to atherogenesis (hardening and occlusions of the arteries).  The heart has to pump harder against the high reisistance and the measurement is the upper, higher number of the calculation (systole).  

The diastole (lower number) is the pressure of the blood flow against resistance during the filling phase.

You may want to google "blood pressure pulse" for more information.  Blood pressure pulse is the difference between systole and diastole calculation i.e. 120-80=40 (normal) and I believe if the calculation exceeds 60 there may be a problem.  However, I don't believe you have any problem with your blood pressure...it isn't static and the variations can be due to many benign circumstances....there my be some worry if blood pressure pulse is consistently high.  It would be a good indication of a vascular disease and usually seen with older people.