I'm 59 yrs old and have been diagnosed with PRV now for little over 20 yrs. I'm fairly active, walking skiing horseback riding. About a year ago I started doing Zumba three times a week. It is a very high cardio exercise. I shortly there after began getting very high HCT counts every mo, causing me to get phlebs every mo. Is this coincidence the natural progression of the disorder or is this the exercise the big trigger ? Anyone else dealing with this problem?