Bathing-induced poisoning mostly occurs when gas water heaters are used, and when gas is not burned sufficiently it can cause carbon monoxide poisoning. Electric water heaters usually do not cause poisoning. Gas water heaters are heated with natural gas, if the gas is not burned sufficiently can produce carbon monoxide, in the indoor ventilation is easy to form carbon monoxide accumulation, and carbon monoxide is colorless and tasteless, people are not easy to notice, in the bath for a long time in the high carbon monoxide concentration environment can lead to poisoning. Carbon monoxide is a gas with very high affinity to hemoglobin, which can compete with oxygen for hemoglobin binding sites, and is not easy to dissociate from hemoglobin after it is formed, thus it can cause severe hypoxia in tissue cells and lead to poisoning. Families installing gas water heaters are advised to properly handle the ventilation system and conduct regular safety inspections to avoid the formation of carbon monoxide accumulation that can cause poisoning.