The Mayo Clinic and the Centers for Disease Control and Prevention publish lists of symptoms for common medical conditions on their respective websites. The Medical Library Association also maintains a list on MLA.org of reliable health sites that the organization vets to ensure high quality and recent content.
Additional websites that the Medical Library Association recommends include MedlinePlus, the American Stroke Foundation, the American Cancer Society and Familydoctor.org, according to the organization. When using a search engine to find results, users should be wary of corporate-sponsored websites and ones that do not end in .gov, .edu or .org. Moreover, users should combine symptoms with additional search terms to find more relevant results and should consider tools such as the U.S. government's Healthfinder website, which redirects users to reliable sources.