2 doctors weighed in:

What causes hypotension during exercise or during exposure to heat? Not dehydration, thyroid, cardiac, pulmonary, or endocrine. BP normal otherwise.

2 doctors weighed in
Dr. Adam Smith
Internal Medicine
1 doctor agrees

In brief: Vasodilation

Hypotension is by definition low BP and while BP may be normal you may experience lower BP relative to your normal when your vessels dilate in response to a rise in internal temperature.
Cardiopulmonary, endocrine, anemia, dehydration and infection are potential causes, as are medication side effects. Note that you can be volume depleted -- with these symptoms -- and not technically dehydrated.

In brief: Vasodilation

Hypotension is by definition low BP and while BP may be normal you may experience lower BP relative to your normal when your vessels dilate in response to a rise in internal temperature.
Cardiopulmonary, endocrine, anemia, dehydration and infection are potential causes, as are medication side effects. Note that you can be volume depleted -- with these symptoms -- and not technically dehydrated.
Dr. Adam Smith
Dr. Adam Smith
Thank
1 comment
Dr. James Lin
Agreed; a great complementary note to expand the limit of 400-letter space so virtual global patients can be better served. .
Dr. James Lin
Urology
1 doctor agrees

In brief: That may be normal

Do you just want to know such phenomenon or do you personally experience symptoms such as dizziness at fast standing-up during exercise? Both exercise and heat exposure normally dilate all blood vessels so to lower blood pressure, but usually autonomic nerve system can automatically regulate the degree of vessel dilation so to maintain circulation to the brain adequately.
But, few cannot do so...

In brief: That may be normal

Do you just want to know such phenomenon or do you personally experience symptoms such as dizziness at fast standing-up during exercise? Both exercise and heat exposure normally dilate all blood vessels so to lower blood pressure, but usually autonomic nerve system can automatically regulate the degree of vessel dilation so to maintain circulation to the brain adequately.
But, few cannot do so...
Dr. James Lin
Dr. James Lin
Thank
1 comment
Dr. James Lin
You may exercise as long as feeling comfortable and taking precaution to suit personal condition. Generally, gradual regular exercise will ease the tendency to develop symptomatic postural hypotension from exercise. Exercise commonsense and ask professionals as needed.
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