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| Effective Health Care (EHC) Program
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Getting Involved</a> </li> </ul> </li> <li class="nav-item menu-item--expanded dropdown" rel="4"> <a href="/research-methods" class="nav-link" aria-expanded="false" aria-haspopup="true" data-drupal-link-system-path="node/4361">Research Methods & Tools</a> <ul class="dropdown-menu"> <li class="dropdown-item" rel="1"> <a href="/research-methods" class="hide-on-desktop" data-drupal-link-system-path="node/4361">Research Methods & Tools</a> </li> <li class="dropdown-item" rel="2"> <a href="/research-methods/tools-and-software" data-drupal-link-system-path="research-methods/tools-and-software">Tools & Software</a> </li> <li class="dropdown-item" rel="3"> <a href="/research-methods/education-resources" data-drupal-link-system-path="research-methods/education-resources">Education Resources</a> </li> </ul> </li> <li class="nav-item menu-item--expanded dropdown" rel="5"> <a href="/about" class="nav-link" aria-expanded="false" aria-haspopup="true" data-drupal-link-system-path="node/4">About 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href="https://info.ahrq.gov/search?q=&category=23">EHC FAQs</a> </li> </ul> </div> </div> </div> </div> <div id="breadcrumbs"> <div class="row row-side-margins"> <div class="col-12 .chrome"> <div id="block-system-breadcrumb-block" class="block block-system block-system-breadcrumb-block"> <div class="content"> <nav role="navigation" aria-label="breadcrumb" style=""> <ol class="breadcrumb"> <li class="breadcrumb-item"> <a href="/">Home</a> </li> <li class="breadcrumb-item"> <a href="/health-topics">Health Topics</a> </li> <li class="breadcrumb-item"> <a href="/health-topics/b">B</a> </li> <li class="breadcrumb-item active"> </li> </ol> </nav> </div> </div> </div> </div> </div> <div id="topics-az"> <div class="row row-side-margins"> <div class="col-12"> <section class="row region region-topics-az"> <div class="views-element-container page-header-topics-alpha block block-views block-views-blocka-z-list-of-health-topics-block-1" id="block-views-block-a-z-list-of-health-topics-block-1"> <div 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views-summary-unformatted"> <a href="/health-topics/S">S</a> </span> <span class="views-summary views-summary-unformatted"> <a href="/health-topics/T">T</a> </span> <span class="views-summary views-summary-unformatted"> <a href="/health-topics/U">U</a> </span> <span class="views-summary views-summary-unformatted"> <a href="/health-topics/V">V</a> </span> <span class="views-summary views-summary-unformatted"> <a href="/health-topics/W">W</a> </span> <span class="views-summary views-summary-unformatted"> <a href="/health-topics/X">X</a> </span> <span class="views-summary views-summary-unformatted"> <a href="/health-topics/Y" class="no-content">Y</a> </span> <span class="views-summary views-summary-unformatted"> <a href="/health-topics/Z" class="no-content">Z</a> </span> </div> </div> </div> </div> </div> </section> </div> </div> </div> <div id="main-content-wrapper"> <section class="main-content"> <div class="container-fluid site-wrap"> <div class="row"> <div class="col-md-12 text-right addthis_toolbox"> </div> </div> <div class="addtoany-toolbox"> <h2 class="addtoany-header">SHARE:</h2> <div class="block block-addtoany block-addtoany-block"> <div class="content"> <span class="a2a_kit a2a_kit_size_16 addtoany_list" data-a2a-url="https://effectivehealthcare.ahrq.gov/health-topics/b" data-a2a-title="Effective Health Care (EHC) Program"><a class="a2a_button_facebook"><img src="/themes/custom/ahrq_bootstrap_barrio/pattern-lab/source/images/theme_core/share_icons/facebook-tiny.png" border="0" alt="Facebook"></a><a class="a2a_button_twitter"><img src="/themes/custom/ahrq_bootstrap_barrio/pattern-lab/source/images/theme_core/share_icons/twitter-tiny.png" border="0" alt="Twitter"></a><a class="a2a_button_email"><img src="/themes/custom/ahrq_bootstrap_barrio/pattern-lab/source/images/theme_core/share_icons/envelope-tiny.png" border="0" alt="Facebook"></a><a class="a2a_button_print"><img 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class="block-sidebar-first block block-menu navigation menu--main" id="block-menu-block-main"> <h2 class="visually-hidden" id="block-menu-block-main-menu">Health Topics</h2> <ul class="clearfix nav navbar-nav collapse dont-collapse-sm navbar-collapse"> <li class="nav-item menu-item--expanded active dropdown sbf-level-one"> <a href="/health-topics" class="mm-health-topics nav-link active" aria-expanded="false" aria-haspopup="true" data-drupal-link-system-path="health-topics">Health Topics</a> <ul class="dropdown-menu menu-level-two"> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/a" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/a">A</a> </li> <li class="dropdown-item active sbf-level-two"> <a href="/health-topics/b" class="hide-on-left-nav active is-active" data-drupal-link-system-path="health-topics/b">B</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/c" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/c">C</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/d" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/d">D</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/e" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/e">E</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/f" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/f">F</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/g" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/g">G</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/h" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/h">H</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/i" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/i">I</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/j" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/j">J</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/k" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/k">K</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/l" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/l">L</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/m" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/m">M</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/n" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/n">N</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/o" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/o">O</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/p" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/p">P</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/q" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/q">Q</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/r" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/r">R</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/s" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/s">S</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/t" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/t">T</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/u" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/u">U</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/v" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/v">V</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/w" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/w">W</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/x" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/x">X</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/Y" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/Y">Y</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics/Z" class="hide-on-left-nav" data-drupal-link-system-path="health-topics/Z">Z</a> </li> <li class="dropdown-item sbf-level-two"> <a href="/health-topics" class="hide-on-desktop" data-drupal-link-system-path="health-topics">Health Topics</a> </li> </ul> </li> </ul> </nav> </div> <div class="col-sm-8 col-md-9 sb1-side-margins"> <div id="main-content"></div> <div class="views-element-container"><div class="view view-a-z-list-of-health-topics view-id-a_z_list_of_health_topics view-display-id-page_1 js-view-dom-id-7f0b5b884c5bfceecf671b899aa0b477ae912b20888f82f5a1aee3ef0e8f8f8c"> <div class="view-content row"> <div class="item-list col-12"> <h3>B</h3> <ul> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/b-vitamins" hreflang="en">B Vitamins</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/back-injuries" hreflang="en">Back Injuries</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/back-pain" hreflang="en">Back Pain</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bacterial-infections" hreflang="en">Bacterial Infections</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/benign-tumors" hreflang="en">Benign Tumors</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/biopsy" hreflang="en">Biopsy</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bipolar-disorder" hreflang="en">Bipolar Disorder</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/birth-defects" hreflang="en">Birth Defects</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/birth-weight" hreflang="en">Birth Weight</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/birthmarks" hreflang="en">Birthmarks</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bladder-diseases" hreflang="en">Bladder Diseases</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bleeding" hreflang="en">Bleeding</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bleeding-disorders" hreflang="en">Bleeding Disorders</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/blood" hreflang="en">Blood</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/blood-clots" hreflang="en">Blood Clots</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/blood-count-tests" hreflang="en">Blood Count Tests</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/blood-disorders" hreflang="en">Blood Disorders</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/blood-pressure-medicines" hreflang="en">Blood Pressure Medicines</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/blood-thinners" hreflang="en">Blood Thinners</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/blood-transfusion-and-donation" hreflang="en">Blood Transfusion and Donation</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/body-weight" hreflang="en">Body Weight</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bone-cancer" hreflang="en">Bone Cancer</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bone-density" hreflang="en">Bone Density</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bone-diseases" hreflang="en">Bone Diseases</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bone-marrow-diseases" hreflang="en">Bone Marrow Diseases</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/botox" hreflang="en">Botox</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/botulism" hreflang="en">Botulism</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bowel-incontinence" hreflang="en">Bowel Incontinence</a></span></div></li> <li><div class="views-field views-field-name"><span class="field-content"><a href="/health-topics/bowel-movement" hreflang="en">Bowel Movement</a></span></div></li> <li><div class="views-field 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