Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for using pre-search triggers. In one aspect, a method includes identifying one or more topics and determining that a confidence score associated with a particular topic of the one or more identified topics satisfies a predetermined threshold value. An occurrence of a pre-search trigger can be detected. In response to determining that the confidence score associated with the particular topic satisfies the predetermined threshold value and detecting the occurrence of the pre-search trigger, a search engine can be instructed to execute a search using a search query associated with the particular topic. A representation of a resource identified in results received in response to the search can be provided.