A Taiwanese man died from pneumonia complications after reportedly using the same thermos flask for a decade without replacement.
Medical examinations revealed he had suffered from lead poisoning, which contributed to a severe lung infection.
Medical Findings and Death
According to a report by Asia Television News on 9 Jun 2025, the man began experiencing health issues after prolonged use of his thermos flask. He was later diagnosed with lead poisoning and a serious lung infection. Despite receiving medical treatment for a year, he died from the illness.
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Medical personnel indicated that his condition may have been linked to the long-term use of the thermos flask, particularly for storing acidic beverages, which could have led to the gradual ingestion of toxic substances.
The man reportedly used the same steel thermos flask daily to brew and store acidic beverages. Despite visible rust forming inside the flask, he did not replace it or clean it thoroughly and continued using it as normal.
Expert Advice on Thermos Safety
Experts caution that thermos flasks containing lead or other heavy metals can release harmful substances when exposed to heat or acidic liquids. Chemical reactions between the container’s interior and acidic drinks may cause these toxins to leach into the contents.
Long-term exposure to heavy metals like lead can lead to accumulation in the body, potentially affecting the liver, kidneys, nervous system, and immune function.
Experts recommend replacing thermos flasks every one to two years and opting for food-grade 304 stainless steel.
The presence of rust or unusual odors inside a thermos is a warning sign, and continued use under such conditions is discouraged.
Furthermore, even high-quality stainless steel bottles can pose risks if not cleaned properly or if used to store acidic beverages for prolonged periods, as low-grade steel may leach nickel or chromium.
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