How a Hot Bath Actually Kills You - Video

In a cold bathroom, your blood vessels tighten and your blood pressure climbs. Then you step into hot water, the vessels open wide and the pressure falls. Standing up makes it worse, like the head rush you feel after getting up too fast. Less blood reaches the brain and the heart can lose its rhythm. You faint, and your head slides under the water. In Japan, about 6,900 people drowned in bathtubs in 2023, nine in ten of them over 65, and a government estimate puts all bathing deaths at 19,000 a year.

This video explains a mechanism and is not medical advice. Most baths are safe; the risk is concentrated in older people and in cold bathrooms in winter.

Sources: nippon.com Japan Data, "Sudden deaths while bathing: heat shock among factors estimated to cause 19,000 annual fatalities" (Consumer Affairs Agency estimate, 2020) and the 2023 vital statistics summary. "Deaths in Bathtubs in Japan: Forensic and Clinical Implications", PubMed 34840209.