The majority of Internet users access health information online using commercial search engines; sometimes preferring search over consultation with doctors and nurses. While the general public trust online health advice, and believe they are effective searchers, studies have reported that most people actually fail to subsequently make correct health decisions based on their search activities. This is concerning as less than two-thirds of those who search online to make health decisions then go on to consult a health professional with regard to their health condition. This thesis aims to create and validate methods to help the general public searching for health advice online (we refer to this search activity as consumer health search). Specifically, we investigate methods to assist people in formulating better queries and more effective appraisal Financial support My doctoral study is sponsored by the Indonesia Endowment Fund for Education (Lembaga Pengelola Dana Pendidikan / LPDP) (20151022014644).