If you accidentally ingest mercury from a thermometer, you will usually experience symptoms in 10 minutes or so. Mercury, the main component of which is mercury, is generally not absorbed by the intestines and is excreted with the stool. Children accidentally ingested mercury for about ten minutes, may appear corrosive stomatitis and gastroenteritis, oral ulceration, abdominal pain, nausea, vomiting, etc., half an hour after the child may be manifested as pain in the mouth, throat, mouth accompanied by a special odor, need to seek medical attention in a timely manner. If the accidental ingestion of mercury, should immediately rinse the mouth, drink a lot of water to induce vomiting, you can choose to take oral egg white or milk, clear the oral residual mercury, reduce the toxic reaction, and promote the discharge of mercury. If the symptoms are serious, you should go to the hospital in time to avoid adverse reactions. Children who have accidentally taken mercury should seek medical attention in time and be treated under the guidance of a doctor. Usually parents should pay attention to put the thermometer out of reach of children to avoid accidental ingestion.