Results: Females and older adolescents were the groups most likely to report having searched for health information online. Younger adolescents tended to prefer online health information to utilizing print materials such as leaflets or books, while some older adolescents found books to be a more efficient means of accessing information. Among the information searches, many involved everyday health concerns such as acne treatment, and many adolescents compared online information with information they received from peers, parents, and other sources, or used the internet when real life sources lacked sufficient information. UK teenagers reported being irritated by internet sites that were not UK-specific because they saw these sites as less helpful to them. While most adolescents reported having criteria by which they judged the trustworthiness of internet sites, these standards varied widely. Many participants mentioned that they liked the fact that they could sometimes avoid visits to the doctor because they found the health information they needed on the internet, and that they appreciated the anonymity of the internet.