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<article class="node node--type-health-topics node--view-mode-full">

  
    

  
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      <div>Asthma</div>

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                <a href="/health/asthma" aria-label="What Is Asthma?-Asthma" hreflang="en">What Is Asthma?</a>
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                  <h1  class="field field--name-title field--type-string field--label-hidden responsive-container responsive-container-constrained field__item"><span class="ht-kicker">Asthma </span>What Is Asthma?<hr>
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	<span class="a2a_kit a2a_kit_size_24 addtoany_list" data-a2a-url="https://www.nhlbi.nih.gov/health/asthma" data-a2a-title="What Is Asthma?">
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            <div class="field field--name-field-component-section-content field--type-text-long field--label-hidden clearfix field__item"><p><span><span><span><span>Asthma is a chronic (long-term) condition that affects the airways in the lungs. The airways are tubes that carry air in and out of your lungs. If you have asthma, the airways can become inflamed and narrowed at times. This makes it harder for air to flow out of your airways when you breathe out.</span></span></span></span></p>

<p><span><span class="entity-embed media entity-embed-nhlbi_video"><div class="embed-video-container embed-video-text-container-enabled align-right">
    
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            <div class="field field--name-field-video-description field--type-text-long field--label-hidden field__item"><p>Asthma is a chronic condition that affects 1 in 13 Americans.</p></div>
      
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<p><span><span><span>About 1 in 13 people in the United States has asthma, <span><span>according to the </span><a href="https://www.cdc.gov/asthma/most_recent_national_asthma_data.htm" rel="noreferrer">Centers for Disease Control and Prevention</a></span>. It affects people of all ages and often starts during childhood. Certain things can set off or worsen <a href="https://www.nhlbi.nih.gov/health/asthma/symptoms" rel="noreferrer">asthma symptoms</a>, such as pollen, exercise, viral infections, or cold air. These are called <a href="https://www.nhlbi.nih.gov/health/asthma/causes" rel="noreferrer">asthma triggers</a>. When symptoms get worse, it is called an <a href="https://www.nhlbi.nih.gov/health/asthma/attacks" rel="noreferrer">asthma attack</a>.</span></span></span></p>

<p><span><span><span>There is no cure for asthma, but <a href="https://www.nhlbi.nih.gov/health/asthma/treatment-action-plan" rel="noreferrer">treatment and an asthma action plan</a> can help you manage it. The plan may include monitoring, avoiding triggers, and using medicines.</span></span></span></p>


  <span data-embed-button="node" data-entity-embed-display="entity_reference:entity_reference_entity_view" data-entity-embed-display-settings="{"view_mode":"callout_descriptive"}" data-entity-type="node" data-entity-uuid="382ad51f-90e4-4087-a91c-6ed21960c8e2" class="align-center embedded-entity" data-langcode="en">    

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<img loading="lazy" src="/modules/custom/nhlbi_blazy/images/clear.png" width="228" height="265" alt="Learn More Breathe Better" data-src="/sites/default/files/styles/crop_callout/public/2022-01/learn%20more%20breathe%20better.png?itok=bkoEfoAE" class="b-lazy image-style-crop-callout" /></div>
      
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            <div class="field field--name-field-callout-description field--type-text-long field--label-hidden field__item">  <h3>What is Asthma?</h3>

<p style="margin-bottom:13px"><span style="font-size:11pt"><span style="line-height:115%"><span style="font-family:Arial,sans-serif"><span style="color:black">Learn basic facts about what asthma is and how it affects your airways.</span></span></span></span></p>

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<p><span><span><span>You can also find asthma guides, tip sheets, and other resources from NHLBI’s <a href="https://www.nhlbi.nih.gov/LMBBasthma" rel="noreferrer">Asthma: Learn More Breathe Better</a> program.</span></span></span></p>

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