MedlinePlus is the National Institutes of Health's Web site for patients and their families and friends. Produced by the National Library of Medicine, the world’s largest medical library, it brings you information about diseases, conditions, and wellness issues in language you can understand.
The National Institute for Health and Care Excellence provides guidelines and advice summaries on a variety of healthcare topics. The list is searchable by guideline type, publication date, and keyword/title.
The Agency for Healthcare Research and Quality (AHRQ) develops the knowledge, tools, and data needed to improve the health care system and help patients, health care professionals, and policymakers make informed health decisions.