CINXE.COM

<!doctype html> <html lang="en"> <head> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <meta http-equiv="X-UA-Compatible" content="IE=edge" /> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"/> <link rel="preconnect" href="https://fonts.googleapis.com"> <link rel="preconnect" href="https://fonts.gstatic.com" crossorigin> <link href="https://fonts.googleapis.com/css2?family=Roboto:wght@100;300;400;500;700&display=swap" rel="stylesheet"> <link rel="stylesheet" href="https://use.fontawesome.com/releases/v5.0.10/css/all.css" integrity="sha384-+d0P83n9kaQMCwj8F4RJB66tzIwOKmrdb46+porD/OvrJ+37WqIM7UoBtwHO6Nlg" crossorigin="anonymous"> <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/" title="The Dublin Core metadata Element Set" /> <script src="https://assets.nlm.nih.gov/uswds/js/uswds-init.min.js"></script> <link rel="stylesheet" href="/home_assets/uswds/css/styles.css"> <title>For the Public</title> <link rel="schema.DC" href="http://purl.org/dc/elements/1.1/" title="The Dublin Core metadata Element Set" /> <meta name="DC.Title" content="For the Public" /> <meta name="DC.Publisher" content="U.S. National Library of Medicine" /> <meta name="DC.Date.Issued" content="2018-04-23" /> <meta name="DC.Date.Modified" content="2023-08-18" /> <meta name="NLMDC.Date.LastReviewed" content="2023-08-18" /> <meta name="NLM.Contact.Email" content="wwwnlm@nlm.nih.gov" /> <meta name="DC.Type" content="List of Links" /> <meta name="NLM.Permanence.Level" content="Permanence Not Guaranteed" /> <meta name="DC.Rights" content="Public Domain" /> <meta name="DC.Language" content="eng" /> <script>(function(w,d,s,l,i){w[l]=w[l]||[];w[l].push( {'gtm.start': new Date().getTime(),event:'gtm.js'} );var f=d.getElementsByTagName(s)[0],j=d.createElement(s),dl=l!='dataLayer'?'&l='+l:'';j.async=true;j.src='//www.googletagmanager.com/gtm.js?id='+i+dl;f.parentNode.insertBefore(j,f);})(window,document,'script','dataLayer','GTM-MT6MLL');</script>  </head> <body>  <noscript><iframe src="//www.googletagmanager.com/ns.html?id=GTM-MT6MLL" height="0" width="0" style="display:none;visibility:hidden" title="googletagmanager"></iframe></noscript>   <a class="usa-skipnav" href="#main">Skip to main content</a> <div class="usa-banner site-banner" aria-label="Official government website"> <div class="usa-accordion"> <header class="usa-banner__header"> <div class="usa-banner__inner"> <div class="grid-col-auto"> <img class="usa-banner__header-flag" src="https://assets.nlm.nih.gov/uswds/img/us_flag_small.png" alt="U.S. flag"/> </div> <div class="grid-col-fill tablet:grid-col-auto"> <p class="usa-banner__header-text"> An official website of the United States government </p> <p class="usa-banner__header-action" aria-hidden="true"> Here’s how you know </p> </div> <button class="usa-accordion__button usa-banner__button" aria-expanded="false" aria-controls="gov-banner"> <span class="usa-banner__button-text">Here’s how you know</span> </button> </div> </header> <div class="usa-banner__content usa-accordion__content" id="gov-banner"> <div class="grid-row grid-gap-lg"> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="https://assets.nlm.nih.gov/uswds/img/icon-dot-gov.svg" role="img" alt="" aria-hidden="true"/> <div class="usa-media-block__body"> <p> <strong> Official websites use .gov </strong> <br /> A <strong>.gov</strong> website belongs to an official government organization in the United States. </p> </div> </div> <div class="usa-banner__guidance tablet:grid-col-6"> <img class="usa-banner__icon usa-media-block__img" src="https://assets.nlm.nih.gov/uswds/img/icon-https.svg" role="img" alt="" aria-hidden="true"/> <div class="usa-media-block__body"> <p> <strong> Secure .gov websites use HTTPS </strong> <br /> A <strong>lock</strong> ( <span class="icon-lock"> <svg xmlns="http://www.w3.org/2000/svg" width="52" height="64" viewBox="0 0 52 64" class="usa-banner__lock-image" role="img" aria-labelledby="banner-lock-title-default banner-lock-description-default" focusable="false"> <title id="banner-lock-title-default">Lock</title> <desc id="banner-lock-description-default">A locked padlock</desc> <path fill="#000000" fill-rule="evenodd" d="M26 0c10.493 0 19 8.507 19 19v9h3a4 4 0 0 1 4 4v28a4 4 0 0 1-4 4H4a4 4 0 0 1-4-4V32a4 4 0 0 1 4-4h3v-9C7 8.507 15.507 0 26 0zm0 8c-5.979 0-10.843 4.77-10.996 10.712L15 19v9h22v-9c0-6.075-4.925-11-11-11z"/> </svg> </span> ) or <strong>https://</strong> means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites. </p> </div> </div> </div> </div> </div> </div>  <header id="siteheader" class="usa-header usa-header--basic"> <div class="usa-nav-container tablet:padding-x-4 mobile-lg:padding-x-2 padding-y-1"> <div class="grid-row padding-y-105"> <div class="grid-col-8 desktop:grid-col-4 tablet-lg:grid-col-4 tablet:grid-col-6"> <a href="https://www.nlm.nih.gov/"> <img src="https://assets.nlm.nih.gov/uswds/img/NLM_White.png" alt="NLM logo" class="logo margin-top-1"> </a> </div> <div class="desktop:grid-col-4 desktop:grid-offset-4 tablet-lg:grid-col-6 tablet-lg:grid-offset-2 tablet:grid-col-6 grid-col-12"> <form class="usa-search desktop:margin-top-2 tablet:margin-top-2 mobile:margin-top-1" role="search" data-gtm-form-interact-id="0" method="get" action="//vsearch.nlm.nih.gov/vivisimo/cgi-bin/query-meta" target="_self" name="searchForm" id="searchForm2"> <input class="usa-input ui-autocomplete-input" aria-label="Search" type="search" name="query" data-gtm-form-interact-field-id="0" id="search2" autocomplete="off" placeholder="Search NLM" > <input type="hidden" name="v:project" value="nlm-main-website"> <button class="usa-button border border-top border-bottom border-right border-white" role="button" aria-label="Search" type="submit"> <span class="usa-search__submit-text"> <i class="fas fa-search"></i> </span> </button> </form> </div> </div> </div> </header> <div class="bg-secondary insertCOOP"> <div class="usa-nav-container"> <div class="usa-navbar "> <button class="usa-menu-btn">Menu</button> </div> <nav aria-label="Primary navigation" class="usa-nav"> <button class="usa-nav__close"><img src="https://assets.nlm.nih.gov/uswds/img/close.svg" alt="close"></button> <ul class="usa-nav__primary usa-accordion insertNav"> <li class="usa-nav__primary-item desktop-lg:margin-x-5 desktop:margin-x-3 tablet:margin-x-0"> <button type="button" class="usa-accordion__button usa-nav__link usa-current" aria-expanded="false" aria-controls="basic-nav-section-one"> <span>Products and Services <i class="fas fa-caret-down margin-left-05"></i> </span> </button> <ul id="basic-nav-section-one" class="usa-nav__submenu bg-secondary" hidden=""> <li class="usa-nav__submenu-item"> <a href="//eresources.nlm.nih.gov/nlm_eresources/"><span>All Products and Services</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//clinicaltrials.gov/"><span>ClinicalTrials.gov</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//collections.nlm.nih.gov/"><span>Digital Collections</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//catalog.nlm.nih.gov"><span>LocatorPlus Catalog</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//meshb.nlm.nih.gov/search"><span>Medical Subject Headings (MeSH)</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//medlineplus.gov/"><span>MedlinePlus</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//pubmed.ncbi.nlm.nih.gov/"><span>PubMed/MEDLINE</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//uts.nlm.nih.gov/uts/"><span>Unified Medical Language System (UMLS)</span></a> </li> </ul> </li> <li class="usa-nav__primary-item desktop-lg:margin-x-5 desktop:margin-x-3 tablet:margin-x-0"> <button type="button" class="usa-accordion__button usa-nav__link usa-current" aria-expanded="false" aria-controls="basic-nav-section-two"> <span> Resources for You <i class="fas fa-caret-down margin-left-05"></i></span> </button> <ul id="basic-nav-section-two" class="usa-nav__submenu bg-secondary" hidden=""> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/portals/researchers.html"><span>For Researchers</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/portals/publishers.html "><span>For Publishers</span></a> </li> <li class="usa-nav__submenu-item"> <a href="ttps://www.nlm.nih.gov/portals/librarians.html"><span>For Librarians</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/training.html "><span>For Educators/Trainers </span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/portals/healthcare.html"><span>For Health care Professionals</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//www.nlm.nih.gov/portals/public.html "><span>For the Public</span></a> </li> </ul> </li> <li class="usa-nav__primary-item desktop-lg:margin-x-5 desktop:margin-x-3 tablet:margin-x-0"> <button type="button" class="usa-accordion__button usa-nav__link usa-current" aria-expanded="false" aria-controls="basic-nav-section-three"> <span>Explore NLM <i class="fas fa-caret-down margin-left-05"></i> </span> </button> <ul id="basic-nav-section-three" class="usa-nav__submenu bg-secondary" hidden=""> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/about/index.html"><span>About the Library</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/about/visitor.html"><span>Visit the Library</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/hmd/index.html"><span>History of Medicine</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/about/org.html"><span>NLM by Organization</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/news/newsandevents.html"><span>News, Events, and Updates</span></a> </li> </ul> </li> <li class="usa-nav__primary-item desktop-lg:margin-x-5 desktop:margin-x-3 tablet:margin-x-0"> <button type="button" class="usa-accordion__button usa-nav__link usa-current" aria-expanded="false" aria-controls="basic-nav-section-four"> <span> Grants and Research <i class="fas fa-caret-down margin-left-05"></i> </span> </button> <ul id="basic-nav-section-four" class="usa-nav__submenu bg-secondary" hidden=""> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/ep/index.html"><span>NLM Extramural Programs</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.nlm.nih.gov/research/index.html"><span>NLM Intramural Research Program</span></a> </li> <li class="usa-nav__submenu-item"> <a href="https://www.ncbi.nlm.nih.gov/"><span>National Center for Biotechnology Information</span></a> </li> <li class="usa-nav__submenu-item"> <a href="//lhncbc.nlm.nih.gov/"><span>Lister Hill National Center for Biomedical Communications</span></a> </li> </ul> </li> </ul> </nav> </div> </div>   <div class="grid-container"> <nav class="usa-breadcrumb usa-breadcrumb--wrap padding-top-1" aria-label="Breadcrumbs"> <ol class="usa-breadcrumb__list"> <li class="usa-breadcrumb__list-item"> <a href="/" class="usa-breadcrumb__link"><span>Home</span></a> </li> </ol> </nav> </div>  <main class="padding-bottom-5" id="main"> <div class="grid-container"> <div class="grid-row"> <div class="col"> <div class="h1">For the Public</div> </div> </div> <div class="grid-row grid-gap">  <div class="tablet:grid-col-8"><p><a href="#find">Find Reliable Health Information</a> | <a href="#search_clinical">Search For Clinical Trials</a> | <a href="#explore_exhibitions">Explore NLM's Exhibitions and Collections</a> | <a href="#learn">Learn about NLM</a></p> <hr /> <h2 id="find">Find Reliable Health Information</h2> <p><a href="https://medlineplus.gov"><strong>MedlinePlus</strong></a><br />MedlinePlus offers up-to-date information about diseases, conditions, and wellness issues in language you can understand. MedlinePlus is also available <a href="https://medlineplus.gov/spanish/">in Spanish</a>.<br /><br /><a href="https://pubmed.ncbi.nlm.nih.gov/"><strong>PubMed</strong></a><br />PubMed has more than 28 million citations for biomedical literature from MEDLINE, life science journals, and online books. Citations may include links to full-text content from PubMed Central and publisher web sites. Learn more about <a href="https://support.nlm.nih.gov/knowledgebase/article/KA-04926/en-us">how to limit your search</a> to articles that have free full text available. <br /><br /><strong>Electronic Databases & Directories</strong><br /><a href="https://www.nlm.nih.gov/services/databases_abc.html" target="_blank" rel="noopener">Alphabetical List</a><br /><a href="https://www.nlm.nih.gov/services/databases_subject.html">Subject List</a></p> <p> </p> <h2 id="search_clinical">Search For Clinical Trials</h2> <p><strong><a href="//www.clinicaltrials.gov/">ClinicalTrials.gov</a> </strong><br />Search ClinicalTrials.gov for actively recruiting studies that you may be able to participate in or learn about new interventions/treatments that are being considered.</p> <p> </p> <h2 id="explore_exhibitions">Explore NLM's Exhibitions and Collections</h2> <p><a href="https://www.nlm.nih.gov/hmd/about/exhibition/index.html"><strong>Exhibition Program</strong></a><br />Browse lively and informative exhibitions and educational resources about the social and cultural history of medicine.</p> <p><a href="https://collections.nlm.nih.gov/"><strong>Digital Collections</strong></a><br />Digital Collections is the Library's free online repository of biomedical resources including books, still images, videos, and maps. All of the content in Digital Collections is freely available worldwide and, unless otherwise indicated, in the public domain.</p> <p><a href="https://catalog.nlm.nih.gov/"><strong>LocatorPlus Online Catalog</strong></a><br />LocatorPlus is the Library's online catalog containing catalog records for books, audiovisuals, journals, computer files, and other materials in the Library's collections.</p> <p> </p> <h2 id="learn">Learn about NLM</h2> <p><a href="https://www.nlm.nih.gov/about/index.html"><strong>About NLM</strong></a><br />Find out more about NLM, the world’s largest biomedical library!</p> <p><a title="Visiting the Library" href="/about/visitor.html"><strong>Visiting the Library</strong><br /></a>Learn about the Library's Reading Rooms, tours, vistor center, and the procedures for visiting the NIH.</p> <p><a href="https://www.nlm.nih.gov/about/briefhistory.html"><strong>History of the Library</strong></a> <br />Read about important events in NLM history and legislative chronology.</p></div>   <div class="tablet:grid-col-4"><h3>Other Portal Pages</h3> <ul> <li><a href="//www.nlm.nih.gov/portals/healthcare.html">For Health Care Professionals</a></li> <li><a href="//www.nlm.nih.gov/portals/librarians.html">For Librarians</a></li> <li><a href="//www.nlm.nih.gov/portals/publishers.html">For Publishers</a></li> <li><a href="//www.nlm.nih.gov/portals/researchers.html">For Researchers</a></li> <li><a id="anch_78" href="https://www.nlm.nih.gov/training.html">Training and Careers</a></li> </ul></div>  </div> <p class=”margin-top-5”><small>Last Reviewed: August 18, 2023</small></p> </div> </main>  <footer class="usa-footer__primary-section padding-top-5 padding-bottom-3 insertfooter"> <div class="grid-container"> <div class="grid-row"> <div class="desktop:grid-col-3 grid-col-6"> <a href="https://www.nlm.nih.gov/socialmedia/index.html"> <p class="text-white">Connect with NLM</p> </a> <ul class="social_media add-list-reset"> <li class="margin-right-05"><a href="https://www.facebook.com/nationallibraryofmedicine"><img class="bg-secondary" src="https://www.nlm.nih.gov/images/facebook.svg" alt="Facebook"></a></li> <li class="margin-right-05"><a title="External link: please review our privacy policy." href="https://www.linkedin.com/company/national-library-of-medicine-nlm/"><img class="bg-secondary" src="//www.nlm.nih.gov/images/linkedin.svg" alt="LinkedIn"></a></li> <li class="margin-right-05"><a title="External link: please review our privacy policy." href="https://twitter.com/NLM_NIH"><img src="//www.nlm.nih.gov/images/twitter.svg" class="img-fluid bg-secondary" alt="Twitter"></a></li> <li class="margin-right-05"><a title="External link: please review our privacy policy." href="https://www.youtube.com/user/NLMNIH"><img src="//www.nlm.nih.gov/images/youtube.svg" class="bg-secondary" alt="You Tube"></a></li> <li class="margin-right-05"><a title="External link: please review our privacy policy." href="https://public.govdelivery.com/accounts/USNLMOCPL/subscriber/new?preferences=true"><img src="//www.nlm.nih.gov/images/mail.svg" class=" bg-secondary" alt="Government Delivery"></a></li> </ul> </div> <div class="desktop:grid-col-3 grid-col-6"> <p class="address_footer text-white"> National Library of Medicine <br> <a href="https://www.google.com/maps/place/8600+Rockville+Pike,+Bethesda,+MD+20894/@38.9959508,-77.101021,17z/data=!3m1!4b1!4m5!3m4!1s0x89b7c95e25765ddb:0x19156f88b27635b8!8m2!3d38.9959508!4d-77.0988323" class="text-white"> 8600 Rockville Pike <br> Bethesda, MD 20894 </a></p> </div> <div class="desktop:grid-col-3 grid-col-6"> <p><a href="/web_policies.html" class="text-white"> Web Policies </a><br> <a href="https://www.nih.gov/institutes-nih/nih-office-director/office-communications-public-liaison/freedom-information-act-office" class="text-white"> FOIA </a><br> <a href="https://www.hhs.gov/vulnerability-disclosure-policy/index.html" class="text-white">HHS Vulnerability Disclosure</a> </p> </div> <div class="desktop:grid-col-3 grid-col-6"> <p><a class="supportLink text-white" href="//support.nlm.nih.gov?from="> NLM Support Center </a> <br> <a href="/accessibility.html" class="text-white"> Accessibility </a><br> <a href="/careers/careers.html" class="text-white"> Careers </a></p> </div> </div> <div class="grid-row"> <div class="grid-col-12"> <p class="text-center text-white"> <a class="text-white" href="//www.nlm.nih.gov/">NLM</a> | <a class="text-white" href="https://www.nih.gov/">NIH</a> | <a class="text-white" href="https://www.hhs.gov/">HHS</a> | <a class="text-white" href="https://www.usa.gov/">USA.gov</a></p> </div> </div> </div> </footer> <script src="//assets.nlm.nih.gov/uswds/js/uswds.min.js"></script> <script src="//assets.nlm.nih.gov/jquery/jquery-latest.min.js"></script> <script src="//assets.nlm.nih.gov/jquery/jquery-migrate-latest.min.js"></script> <script src="/scripts/nlm_autocomplete.js"></script> <script src="/scripts/nlm_uswds.js"></script> </body> </html>