Thanks for your question.
High Blood Pressure does not affect how long your menstrual cycle lasts. I cannot think of any mechanism that could occur to change the length of one's cycle based on their blood pressure being elevated.
If you've noticed a change in your cycle, I would discuss this with your physician and have a GYN examination to be sure that nothing else is going on that might explain the change in the length of your cycles. Any change, or abnormal bleeding should be evaluated.
Martin Cane, M.D.
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