3. When You’re Extremely Tired or Weak

Why to avoid it: Fatigue can lower blood pressure. Standing in a hot shower or getting into a hot bath could cause sudden drops in blood pressure and blood flow to the brain, potentially triggering a fainting spell or stroke in vulnerable people.

Tip: Rest and hydrate first. If bathing is necessary, use warm (not hot) water and have someone nearby if you’re unwell.

4. Very Late at Night

Why to avoid it: Body temperature naturally drops at night to prepare for sleep. Bathing in cold water late at night can cause a temperature shock, especially in elderly individuals, possibly affecting heart function and circulation.

Tip: If you must bathe at night, keep the water warm and the bathroom temperature comfortable.

5. In Very Cold or Very Hot Water

Why to avoid it: Extreme temperatures stress your circulatory system. Hot water can cause blood vessels to dilate too much, leading to dizziness or fainting. Cold water can cause sudden constriction, spiking blood pressure and increasing stroke risk.

Tip: Use lukewarm water—especially if you’re older or have heart or blood pressure issues.