A hot shower is a common place as well because the heat has already caused a lot of the blood to be shifted to the superficial tissues (a mechanism the body uses to cool down). With less blood available in tank so to speak, even a slight dip in blood pressure can cause syncope.
Why do I feel like Im going to pass out when I get hot?
Dizziness and fainting – heat-related dizziness and fainting results from reduced blood flow to the brain. Heat causes an increase in blood flow to the skin and pooling of blood in the legs, which can lead to a sudden drop in blood pressure. There can be a feeling of light-headedness before fainting occurs.
Can hot water make you faint?
Hotter water in hot tubs poses increased health risks from fainting, Mayo Clinic researchers report.
How hot does it have to be to pass out?
A body temperature below 71.6˚F (22˚C) can result in muscles becoming rigid, blood pressure becoming extremely low or even absent, heart and breathing rates decreasing, and it can ultimately lead to death.