This article was written by a UITM professor with the National Sports Board.
Why Do Strokes Happen in The Bathroom?
He has been advising people not to wet the head and hair first when showering as this is in the wrong sequence. This will cause the body to adjust its temperature too quickly because we are warm blooded. By performing this incorrect sequence, blood rushing up the head may cause capillary or artery breakage hence a stroke and a fall.
The right way of showering is to start wetting the body from the feet up to the shoulders slowly.
A sensation of vapor coming out of the crown on the head or bristling of body hair may be felt on some people.
Follow this procedure then shower as usual. Especially useful for people with high blood pressure, high cholesterol, and even migraine.