i cannot find any evidence showing that rapid weight loss causes blood pressure to rise. in general weight loss typically helps to reduce blood pressure. it's important to remember that other factors can affect blood pressure such as genetics age stress and certain medical conditions. i suggest making an appointment with your healthcare provider to help you figure it out. its unlikely that dehydration or not cooling down could be the cause. here's an article with more common causes of high blood pressure (hypertension).
can rapid weight loss actually be causing me to have higher blood pressure? . my bicycle is my main transportation. i live in az and i ride an avg of 8 miles a day and have lost over 50 lbs in the last 10 wks. i have been overweight all my life and always had high blood pressure. my blood pressure has been lower than it has been in over 20 yrs until about 2-3 wks ago. it is trending back up with no dietary change or decrease in exercise. can dehydration or not enough "cool down" time from physical activity be to blame?