Croatia is one of the European countries where the number of people searching for online health information has recently increased. Searching for information helps to adapt to crisis situations such as COVID19 pandemic. Despite the many benefits of search, it can also have undesirable outcomes such as cyberchondria, i.e. repeated and intensive searching for health information on the Internet, which is caused by anxiety and can lead to even greater anxiety. Such outcomes are most likely to occur in crisis situations and are associated with the perception of severity and vulnerability. The aim of this study was to determine whether there is a difference in the frequency of health information searches and the level of cyberochondria in pandemic time compared to the prepandemic and to determine whether there is an association between assessments of the severity of the COVID19 situation and vulnerability with the frequency of health information searches and the level of cyberchondria.. The research was conducted in three measurements – in 2020 (N=959), 2021 (N=500) and 2022 (N=710) on young adults. An online questionnaire was used, which included sociodemographic questions, questions on threat assessment, online health behaviors, and the Short Cyberhondria Scale (JokićBegić, Mikac, Čuržik and Sangster Jokić, 2017). There is no significant difference in the frequency of health information searches with respect to the three time periods when the questionnaire was completed. There is also no significant difference in the level of cyberochondria between the groups of participants who completed the questionnaire during the pandemic, as well as between the groups of participants who completed the questionnaire in the first and third measurements. However, there is a significant difference in the level of cyberchondria between the groups of participants who completed the questionnaire in the first and second measurements. Participants who completed the questionnaire in 2020 have higher levels of cyberochondria, compared to participants who completed the questionnaire in 2021. There are positive correlations between assessments of the severity of the COVID19 situation and one's own vulnerability with the frequency of health information searches and the level of cyberchondria.