why would my b/p drop after physical exertion. within 3 minutes after working out my b/p has been dropping from the 150's/70's to 80/40 causing me to become light headed and very weak.it will normally recover in about 30 min. but the other day it stayed in the low range for over 12 hours.
While it is impossible to know exactly what is causing this to occur without seeing you in person for evaluation and knowing your full history, we can be certain that this is not normal and needs to be evaluated by your physician. Sometimes there are structural issues within the heart (valvular disease or asymmetric muscle thickening with something like HCM-hypertrophic cardiomyopathy) or arrhythmias (abnormal beating of the heart) that can cause your blood pressure to drop with exercise. If you take medications that lower your heart rate/blood pressure, it may simply be an issue of timing of when you take them. You should see a physician ASAP and an EKG and echo (ultrasound of the heart) may be helpful for figuring out what is going on.
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