Medline Plus is a great easy to understand resource from the National Institutes of Health. It's the world's largest medical library and can give you information about diseases, conditions, and wellness issues.
"Health professionals and consumers alike can depend on it for information that is authoritative and up-to-date. MedlinePlus has extensive information from the National Institutes of Health and other trusted sources on over 1000 diseases and conditions. There are directories, a medical encyclopedia and a medical dictionary, health information in Spanish, extensive information on prescription and nonprescription drugs, health information from the media, and links to thousands of clinical trials. MedlinePlus is updated daily..."
Find great, credible information on Health Topics, Drugs and Supplements, and there are great Videos and Tools. The health topics can be browsed or searched for easy access. The searching capacity is also wonderful.