TweetIMO, most BP caused while on cycle is related to edema aka water retention. More reason to take your anti-e's.
Dont go jumping on the BP medication. Find out the source first. IT can be very dangerous to jump on the BP meds and then come off cycle, you may lower it too much, which should be obviously bad.
I once had a raise that was due to a very high RBC count from an extensive run with EQ and VitB-12. I dontated a pint of blood and it took care of it. I think that it is very rare though. The main side I experienced was too much sweating, not the BP really.