Habit 1: Entering very hot or very cold water abruptly.

In winter, many people turn the water on full blast looking for steam. In summer, they jump directly under an icy stream to “cool off.” This can cause thermal shock: the body reacts by suddenly constricting or dilating blood vessels.

Very cold water: the body can constrict blood vessels (vasoconstriction) and raise blood pressure.

Very hot water: can dilate blood vessels (vasodilation), lower blood pressure, and cause dizziness or fainting, especially when standing up.

What to do instead:

Aim for lukewarm, comfortable water, avoiding extremes.

Adjust the temperature before entering.

Enter gradually, without any sudden changes to your body.

Habit 2: Wetting your head and chest first

Many people, out of habit, wet their head or chest as soon as they turn on the water. In some older adults, this can trigger a sudden response from the nervous system (very sensitive temperature sensors in areas near the torso), with rapid changes in blood pressure or dizziness.

What to do instead: the safest order

Work from the area furthest from your heart toward the center, gradually:

Feet and ankles

Calves and knees

Hands and forearms

Shoulders and chest

Head last

This helps the body adapt step by step.

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