Possible hazards to humans from broken mercury thermometers include glass puncture wounds and mercury poisoning. Mercury thermometers should be used with caution, and if broken, disposed of properly and in a timely manner. Mercury thermometer broken improperly handled may produce certain hazards to the human body, on the one hand, the broken ends and glass slag may stab the human body, on the other hand, the leakage of mercury such as through the skin or respiratory tract into the body can lead to mercury poisoning, manifested as nausea, vomiting, dizziness, headache and other discomforts. If the thermometer is accidentally broken, wear gloves for protection, use cardboard tools to gather the leaking mercury droplets together and collect them into an airtight container, clean up the glass crumbs carefully and keep the room well ventilated. If there is any special discomfort, seek medical advice.