If the thermometer is broken, and if the mercury is accidentally contacted or inhaled through the respiratory tract, poisoning is usually possible. Symptoms of poisoning: first of all, it will be manifested as neurological symptoms, common dizziness, headache, nausea, vomiting, or appear to have a pale face, mental state is relatively poor, there will also be a serious change in the state of consciousness, for example, there is a blurring of consciousness, and even coma, shock, convulsions and other serious symptoms of poisoning. Secondly, it will be manifested as contact with mercury skin mucous membrane performance, may lead to local redness, swelling, pain, pain, or local skin ulceration and so on. Then, if the poisoning is absorbed through the respiratory tract, there may be irritating dry cough, or even symptoms of respiratory distress.