The increasing tendency to consume news via social media is raising the exposure to fake-news stories with much greater frequency than in the past. Beliefs in health misinformation can have an adverse impact on health behaviours and finally on policy outcomes. The objective of this study was to analyse the mechanisms underlying the believability of fake news in the context of the Italian health system. In this context, we test if prior exposure to fake news increase perception of accuracy. To do so, a three-stage online survey was conducted on 1000 participants which were presented with actual fake-news headlines as they were seen on Facebook. Participants were randomized into two conditions: a) where all of the fake-news headlines (but none of the real-news headlines) were accompanied by a Disputed by 3rd Party Fact- Checkers tag or b) where fake and real-news headlines were displayed without warnings. Preliminary results shown the exposure to fake news is not mitigated by third party fact checker and hence that exposure to fake news is sufficient to increase the perception of their accuracy. All this has shown a slowdown in access to care and, above all, in the early care of patients, with negative consequences both from the point of view of patients' quality of life and direct and indirect costs.