Can a mercury thermometer cause poisoning?

　　In most cases, a single mercury thermometer is not sufficient to cause poisoning. However, if a mercury thermometer is broken in an enclosed, confined space and the mercury is accidentally ingested or large amounts of mercury vapor are inhaled, poisoning may occur. If any abnormalities occur, prompt medical attention is recommended. Detailed analysis is as follows:

　　If a mercury thermometer breaks in a well-ventilated open space, the mercury inside will quickly volatilize and be effectively expelled outdoors, so the amount of mercury vapor inhaled by the human body is usually minimal and generally insufficient to cause acute poisoning symptoms. As long as the mercury is not accidentally ingested or contacted for prolonged periods, it typically does not pose serious harm to human health.

　　If a mercury thermometer breaks in an enclosed, confined space, mercury vapor generated from the volatilization of mercury can accumulate within the limited space, causing the concentration to gradually increase. If a person remains in such an environment for an extended period and inhales large amounts of mercury vapor, it may lead to poisoning symptoms such as headache, dizziness, fatigue, insomnia, and memory impairment, among other neurological symptoms. Additionally, if mercury is accidentally ingested or comes into contact with broken skin, mercury may be absorbed through the skin, increasing the risk of poisoning.

　　If a mercury thermometer is accidentally broken, immediately open windows and doors for ventilation, promptly clean up the spilled mercury, and avoid contact with the skin and mouth during the cleanup process to reduce the potential health risks associated with mercury exposure.