If the mercury thermometer does not shake down, you need to see if the way you shake it by hand is correct, you should make the mercury end face down, shake it downward with the force of your wrist, and observe the changes in the thermometer when you shake it. In addition to shaking the thermometer, there may be some relationship with the problem of the thermometer itself, some thermometers have quality problems, there will also be the situation of not shaking down. Regular observation of temperature changes, if there is still a failure to shake down, it is recommended to replace the mercury thermometer for use. If the problem is considered to be the quality of the thermometer, it is recommended that it be replaced in a timely manner. It is also necessary to measure other related tests, and in addition to measuring the temperature, it is necessary to observe other changes such as blood count and inflammatory markers.