Very hot water causes a sudden dilation of the blood vessels in the skin. This causes blood to redistribute rapidly and blood pressure to drop sharply.
In older adults or those taking blood pressure medication, this drop can cause:
Dizziness
Leg weakness
Blurred vision
Fainting
Fainting in the bathroom almost always ends in a fall, and a fall can lead to head injuries, brain hemorrhages, or fractures.
What to Do
The safest temperature for the body is lukewarm, close to body temperature, between 36 and 38 °C (97 and 100.4 °F).
If the water burns when you touch it with the back of your hand, it’s too hot.
2. Showering Right After Eating
After a meal, much of the blood is directed to the digestive system. If you then take a hot shower, the heat also draws blood to the skin. The result is internal competition for blood flow.
