Drawing on the dual system theory, a configuration model for cyberchondria was proposed to explore the complex interplay between the individual characteristics, socioemotional system, and cognitive control system in causing cyberchondria. A questionnaire was distributed to users who have searched for health information on social media platforms. A total of 320 valid responses were collected. The fuzzy-set qualitative comparative analysis (fsQCA) method was employed to analyse the data. Four equifinal configurations leading to cyberchondria were identified, with fear of missing out, perceived information overload, and perceived communication overload as core conditions. Additionally, one configuration leading to the absence of cyberchondria was identified. We further explored the configurations for the four sub-dimensions of cyberchondria. The results revealed four configurations for excessiveness, two for distress, one for compulsion, and three for reassurance. Four theoretical propositions leading to cyberchondria and its sub-dimensions are proposed. This provides a dual system perspective into how fear of missing out can evolve into cyberchondria and explains the complexities of cyberchondria between different individuals.
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