Comprehensive health & medical sites


National Library of Medicine
The website for lay persons most often recommended by medical librarians. The premier source for comprehensive, trustworthy, & well-organized information in many languages.

American Academy of Family Physicians

U.S. Department of Health & Human Services

“Medical Dictionary”

The Free Dictionary by Farlex
Brief explanations are typically followed by extensive information. Content is based upon reputable reference works.


Extensive coverage of medical news. A free, for-profit site requiring one-time registration to access content for consumers & health care professionals.

PubMed (previously known as MEDLINE)

National Library of Medicine, National Institutes of Health
This is the world’s largest database of professional literature on health conditions, biomedical research, and the health care industry. Search results consist of article citations. These usually include an abstract (summary). Although many citations link to free full-text articles, payment is more often required to access the full text of an article. You may be able to obtain articles for no or minimal cost from your local hospital or consumer health library. This guide will help you search the database more effectively.

Focused health & medical sites

“Clinical Trials”

On MedlinePlus, National Library of Medicine
In addition to studies of drugs, surgical techniques, and other treatments, researchers also examine lifestyle factors that affect health, such as nutrition, exercise, and social relationships. Learn about the pros and cons of participating in clinical trials, and find studies that you might be able to participate in.

Genetics Home Reference

National Library of Medicine

Go Ask Alice

Columbia University
Factual, non-judgmental replies to college students’ questions about sex & sexuality, relationships, alcohol & drug use, stress, and other concerns will also inform adults.

Lab Tests Online

AACC | American Academy of Clinical Chemistry

NORD | National Organization for Rare Disorders

Think “less common,” not necessarily “rare.”


FEMA, the Federal Emergency Management Agency
Prepare for (and recover after) a disaster or pandemic.

Guides to health-information resources

Federal Health Information Centers and Clearinghouses

Office of Disease Prevention and Health Promotion
Extensive directory of federal agencies providing health-related information & services.

“Find a Library”

National Library of Medicine
U.S. & Canadian libraries providing health & medical information to the public.


MedlinePlus, a service of the National Library of Medicine
Locate patient, professional, and governmental organizations devoted to particular health concerns (for example, aphasia, assistive devices, or antibiotics).

Languages other than English

MedlinePlus, en español

National Library of Medicine
The premier U.S. health website. Every Spanish article is accompanied by an English version.

“Health Information in Multiple Languages”

On MedlinePlus, National Library of Medicine
The premier U.S. health website has information in 45 languages; topic coverage is limited for uncommon languages. Every article includes an English translation., en español

U.S. Department of Health & Human Services

“International Languages”

Stanford Health Library, Stanford Hospital & Clinics
Link to sites with information in multiple languages.

KidsHealth, en espanol

Nemours Foundation
Separate portals for parents, kids, & teens.

Lab Tests Online

American Association for Clinical Chemistry
Information about lab tests in 14 languages for 17 countries. As countries differ in testing standards and interpretation of test results, some information may not exactly match U.S.-based guidelines.

WHO | World Health Organization

In upper right corner, select Arabic, Simplified Chinese, French, Russian, or Spanish.