Signs and Symptoms of Flu | Influenza (Flu)

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href="https://espanol.cdc.gov/enes/flu/signs-symptoms/index.html">Español</a> </div> </section> <div class="cdc-page-title cdc-page-offset syndicate"> <h1>Signs and Symptoms of Flu</h1> </div> <div id="content" class="cdc-page-content cdc-page-offset syndicate container"> <div class="cdc-dfe-body "> <div class="cdc-dfe-body__top "> <div class="dfe-section dfe-section--page-summary summary-list" data-section="cdc_symptoms_page_summary"> <div class="dfe-section__header"> <h2 class="editor-block--title" id="heading-soepzlkjdw">About</h2> </div> <div class="dfe-section__content"> <ul class="nested-list"> <li class="level-1">Influenza (also known as “flu”) is a contagious respiratory illness caused by influenza viruses.<ul> </ul> </li> <li class="level-1">It can cause mild to severe illness, and at times can lead to death.<ul> </ul> </li> </ul> <div class="dfe-section__nav hide" id="dfe-section__nav"> <div class="dfe-section__nav__header" id="dfe-section__nav__header"> </div> <div class="dfe-section__nav-links" id="dfe-section__nav-links"> </div> </div> </div> <div class="dfe-section__image" id="page-summary-image"> <figure class="dfe-image dfe-image__large"><div class="image-container fluid aspect-ratio-16-9 stretch"><img src="/flu/images/homepage/symptoms2.png" alt="Flu can cause mild to severe illness. Learn the symptoms of flu." title="Flu can cause mild to severe illness. Learn the symptoms of flu."></div></figure> </div> <div id="nav-buttons"> </div> </div> </div> <div class="cdc-dfe-body__center "> <div class="dfe-section" data-section="cdc_symptoms_symptoms"> <a class="onThisPageAnchor" id="cdc_symptoms_symptoms-symptoms" name="Symptoms" title="Symptoms"></a><h2 class="editor-block--title" id="heading-agjgl-einc">Symptoms</h2> <p>Flu can cause mild to severe illness, and at times can lead to death. Flu symptoms usually come on suddenly. People who have flu often feel some or all of these signs and symptoms:</p> <ul class="nested-list"> <li class="level-1">fever* or feeling feverish/chills<ul> </ul> </li> <li class="level-1">cough<ul> </ul> </li> <li class="level-1">sore throat<ul> </ul> </li> <li class="level-1">runny or stuffy nose<ul> </ul> </li> <li class="level-1">muscle or body aches<ul> </ul> </li> <li class="level-1">headaches<ul> </ul> </li> <li class="level-1">fatigue (tiredness)<ul> </ul> </li> <li class="level-1">some people may have vomiting and diarrhea, though this is more common in children than adults.<ul> </ul> </li> </ul> <p>*It's important to note that not everyone with flu will have a fever.</p> <div class="dfe-block dfe-block--keep_reading"><b>Keep Reading:</b> <a href="/flu/about/flu-vs-covid19.html">Similarities and Differences between Flu and COVID-19</a></div> </div> <div class="dfe-section" data-section="cdc_symptoms_section_2"> <a class="onThisPageAnchor" id="cdc_symptoms_section_2-flu-complications" name="Flu%20Complications" title="Flu Complications"></a><h2 class="editor-block--title" id="heading-aosrp3d4ub">Flu Complications</h2> <p>Most people who get flu will recover in a few days to less than two weeks, but some people will develop complications (such as pneumonia) as a result of flu, some of which can be life-threatening and result in death.</p> <p>Sinus and ear infections are examples of moderate complications from flu, while pneumonia is a serious flu complication that can result from either flu virus infection alone or from co-infection of flu virus and bacteria. Other possible serious complications triggered by flu can include inflammation of the heart (myocarditis), brain (encephalitis) or muscle tissues (myositis, rhabdomyolysis), and multi-organ failure (for example, respiratory and kidney failure). Flu virus infection of the respiratory tract can trigger an extreme inflammatory response in the body and can lead to <a href="https://www.cdc.gov/sepsis/index.html" class="">sepsis</a>, the body's life-threatening response to infection. Flu also can make chronic medical problems worse. For example, people with <a href="https://www.cdc.gov/flu/highrisk/asthma.htm" class="">asthma</a> may experience asthma attacks while they have flu, and people with chronic heart disease may experience a worsening of this condition triggered by flu.</p> <div class="dfe-block dfe-block--keep_reading"><b>Keep Reading:</b> <a href="/flu/highrisk/heartdisease.html">Flu and People with Heart Disease or History of Stroke</a></div> </div> <div class="dfe-section" data-section="cdc_symptoms_section_3"> <a class="onThisPageAnchor" id="cdc_symptoms_section_3-people-at-higher-risk-from-flu" name="People%20at%20Higher%20Risk%20from%20Flu" title="People at Higher Risk from Flu"></a><h2 class="editor-block--title" id="heading-ursbqdflh7">People at Higher Risk from Flu</h2> <p>Anyone can get sick with flu, even healthy people, and serious problems related to flu can happen to anyone at any age, but some people are at higher risk of developing serious flu-related complications if they get sick. This includes people 65 years and older, people of any age with certain chronic medical conditions (such as asthma, diabetes, or heart disease), pregnant people and children younger than 5 years, but especially those younger than 2 years old.</p> <div class="dfe-block dfe-block--keep_reading"><b>Keep Reading:</b> <a href="/flu/highrisk/index.htm">People at Increased Risk for Flu Complications</a></div><h3 id="heading-wt4p1wfjig">Cold versus Flu</h3> <div class="dfe-block dfe-block--cdcmodule dfe-block--width-standard"><div class="dfe-block__inner"><div class="cdc-dfe-content-table"> <div class="right-mask"></div> <div class="cdc-content-table header-row" role="table" aria-label="table"> <div role="rowgroup"> <div class="row cdc-header" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Signs and Symptoms</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p><strong>Cold</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p><strong>Influenza (Flu)</strong></p> </div></div> </div> <div class="row" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Symptom onset</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Gradual</p> </div></div> <div class="col-4"> <div role="cell"> <p>Abrupt</p> </div></div> </div> <div class="row alternate-bg" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Fever</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Rare</p> </div></div> <div class="col-4"> <div role="cell"> <p>Common; lasts 3-4 days</p> </div></div> </div> <div class="row" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Aches</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Slight</p> </div></div> <div class="col-4"> <div role="cell"> <p>Common; often severe</p> </div></div> </div> <div class="row alternate-bg" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Chills</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Uncommon</p> </div></div> <div class="col-4"> <div role="cell"> <p>Fairly common</p> </div></div> </div> <div class="row" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Fatigue, weakness</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Sometimes</p> </div></div> <div class="col-4"> <div role="cell"> <p>Usual</p> </div></div> </div> <div class="row alternate-bg" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Sneezing</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Common</p> </div></div> <div class="col-4"> <div role="cell"> <p>Sometimes</p> </div></div> </div> <div class="row" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Chest discomfort, cough</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Mild to moderate; hacking cough</p> </div></div> <div class="col-4"> <div role="cell"> <p>Common; can be severe</p> </div></div> </div> <div class="row alternate-bg" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Stuffy nose</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Common</p> </div></div> <div class="col-4"> <div role="cell"> <p>Sometimes</p> </div></div> </div> <div class="row" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Sore throat</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Common</p> </div></div> <div class="col-4"> <div role="cell"> <p>Sometimes</p> </div></div> </div> <div class="row alternate-bg" role="row"> <div class="col-4"> <div role="cell"> <p><strong>Headache</strong></p> </div></div> <div class="col-4"> <div role="cell"> <p>Rare</p> </div></div> <div class="col-4"> <div role="cell"> <p>Common</p> </div></div> </div> </div> </div> </div></div></div><div class="dfe-block dfe-block--cdcmodule dfe-block--width-standard"><div class="dfe-block__inner"><div class="cdc-textblock"><h2><a id="anchor_1722534792989" class="onThisPageAnchor" title="Emergency Warning Signs of Flu Complications"></a>Emergency Warning Signs of Flu Complications</h2> <p>People experiencing these warning signs should obtain medical care right away.</p> <div class="row"> <div class="col-6"> <p><strong>In children</strong></p> <ul> <li>Fast breathing or trouble breathing</li> <li>Bluish lips or face</li> <li>Ribs pulling in with each breath</li> <li>Chest pain</li> <li>Severe muscle pain (child refuses to walk)</li> <li>Dehydration (no urine for 8 hours, dry mouth, no tears when crying)</li> <li>Not alert or interacting when awake</li> <li>Seizures</li> <li>Fever above 104 degrees Fahrenheit that is not controlled by fever-reducing medicine</li> <li>In children younger than 12 weeks, any fever</li> <li>Fever or cough that improve but then return or worsen</li> <li>Worsening of chronic medical conditions</li> </ul> </div> <div class="col-6"> <p><strong>In adults</strong></p> <ul> <li>Difficulty breathing or shortness of breath</li> <li>Persistent pain or pressure in the chest or abdomen</li> <li>Persistent dizziness, confusion, inability to arouse</li> <li>Seizures</li> <li>Not urinating</li> <li>Severe muscle pain</li> <li>Severe weakness or unsteadiness</li> <li>Fever or cough that improve but then return or worsen</li> <li>Worsening of chronic medical conditions</li> </ul> </div> </div> <p><strong>These lists are not all inclusive. Please consult your medical provider for any other symptom that is severe or concerning.</strong></p> </div> </div></div><div class="dfe-block dfe-callout dfe-callout--calltoaction"><h3>Diagnosis&lrm;</h3> <div class="dfe-callout__body"><div class="callout-desc">A number of tests are available to detect influenza viruses.</div> </div><div class="dfe-callout__button"><a href="/flu/testing/index.html" class="button hollow">Diagnosis</a></div></div> <div class="dfe-block dfe-callout dfe-callout--calltoaction"><h3>The Difference Between Flu and COVID-19&lrm;</h3> <div class="dfe-callout__body"><div class="callout-desc">Flu and COVID-19 are both contagious respiratory illnesses, but they are caused by different viruses.</div> </div><div class="dfe-callout__button"><a href="/flu/about/flu-vs-covid19.html" class="button hollow">Similarities and Differences between Flu and COVID-19</a></div></div> <div class="dfe-block dfe-callout dfe-callout--calltoaction"><h3>The Difference Between Cold and Flu&lrm;</h3> <div class="dfe-callout__body"><div class="callout-desc">Flu and the common cold are both respiratory illnesses but they are caused by different viruses.</div> </div><div class="dfe-callout__button"><a href="/flu/about/coldflu.html" class="button hollow">Cold Versus Flu</a></div></div> </div> </div> <div class="cdc-dfe-body__right page-right-rail"> <aside class="page-right-rail__static noindex" role="complementary"> <div class="on-this-page " data-sid=""> <h2 class="on-this-page__heading"> On This Page </h2> <div class="card-body"> <ul> <li><a href="#cdc_symptoms_symptoms-symptoms">Symptoms</a></li> <li><a href="#cdc_symptoms_section_2-flu-complications">Flu Complications</a></li> <li><a href="#cdc_symptoms_section_3-people-at-higher-risk-from-flu">People at Higher Risk from Flu</a></li> <li><a href="#anchor_1722534792989">Emergency Warning Signs of Flu Complications</a></li> </ul> </div> </div> </aside> <aside class="page-right-rail__dynamic noindex" 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