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Twenty years ago，getting sick meant visiting a doctor．Now，many internet tools seek to identify what disease a person has based on symptoms described．The following are some studies．

Study 1 A study led by an American researcher showed these web-based tools may be useful for patients who are trying to decide whether they should get to a doctor quickly． Besides，online symptom checkers can help seriously-ill patients for a guided care．According to the findings，overall the 23 symptom checkers provided correct advice in 58 percent of cases in more critical cases．

Study2 Australian researchers at Edith Cowan University in Perth did a new study，which examined 36 international internet-based symptom checkers，finding these online symptom checkers were rarely correct and could be harmful． Michella Hill，a leader of the research，said，"While it may be tempting to use these tools to find out what may be causing your symptoms，most of the time they are unreliable and sometimes can be dangerous．"

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