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high thyroid hormone levels can cause fast heart rate.
taking hot showers after you exercise can cause vasodilation of your blood vessels and this can cause you to drop your blood pressure and this can cause some occasional skipped heart beats in the hot shower.
this is just your heart adjusting to blood pressure changes in your body and vasodilation from taking a hot shower.
the cold water could be causing coldness next to the heart which can cause these skipped heart beats.
I would stop drinking cold water before hot showers.
but you should drink water and fluids during exercise and after exercise.
forget about it.
your heart is fine
you don't have to drink cold water before showing.
let me know if you have other questions.
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