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<link rel="alternative" hreflang="en" href="https://medlineplus.gov/ency/article/001034.htm"/><meta property="og:title" content="Mastoiditis: MedlinePlus Medical Encyclopedia"/><meta property="og:url" content="https://medlineplus.gov/ency/article/001034.htm"/><meta property="twitter:title" content="Mastoiditis: MedlinePlus Medical Encyclopedia"/><meta name="twitter:card" content="summary_large_image"/><meta name="description" content="Mastoiditis is an infection of the mastoid bone of the skull. The mastoid bone is located just behind the ear."/><meta itemprop="description" name="description" content="Mastoiditis is an infection of the mastoid bone of the skull. The mastoid bone is located just behind the ear."/><meta property="og:description" content="Mastoiditis is an infection of the mastoid bone of the skull. The mastoid bone is located just behind the ear."/><meta property="twitter:description" content="Mastoiditis is an infection of the mastoid bone of the skull. The mastoid bone is located just behind the ear."/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_2.jpg"/><meta property="og:image" content="https://medlineplus.gov/images/share_ency_3.jpg"/><meta property="twitter:image" content="https://medlineplus.gov/images/share_ency_1.jpg"/>
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</div><div><span>Mastoiditis</span></div></div>
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<article><div id="d-article"><div class="page-info"><div class="page-title"><a name="start" id="start">
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</a><h1 class="with-also" itemprop="name">Mastoiditis</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>Mastoiditis is an infection of the mastoid bone of the skull. The mastoid bone is located just behind the ear.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Causes</h2></div><div class="section-button"><button type="submit" aria-controls="section-1" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-1"><p>Mastoiditis is most often caused by a middle ear infection (<a test="test" href="./000638.htm">acute otitis media</a>). The infection may spread from the ear to the mastoid bone. This bone has a honeycomb-like structure that fills with infected material and may break down. </p><p>The condition is most common in children. Before antibiotics, mastoiditis was one of the leading causes of death in children. The condition does not occur very often today. It is also much less dangerous.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Symptoms</h2></div><div class="section-button"><button type="submit" aria-controls="section-2" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-2"><p>Symptoms include:</p><ul><li><a test="test" href="./003042.htm">Drainage from the ear</a></li><li><a test="test" href="./003046.htm">Ear pain or discomfort</a></li><li>Fever, may be high or suddenly increase</li><li>Headache</li><li>Hearing loss</li><li>Redness of the ear or behind the ear</li><li>Swelling behind the ear, may cause ear to stick out or feel as if it is filled with fluid</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Exams and Tests</h2></div><div class="section-button"><button type="submit" aria-controls="section-3" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-3"><p>An exam of the head may reveal signs of mastoiditis. The following tests may show an abnormality of the mastoid bone:</p><ul><li><a test="test" href="./003330.htm">CT scan</a> of the ear</li><li><a test="test" href="./003786.htm">Head CT scan</a></li><li>Head MRI scan</li></ul><p>A culture of drainage from the ear may show bacteria.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Treatment</h2></div><div class="section-button"><button type="submit" aria-controls="section-4" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-4"><p>Mastoiditis may be hard to treat because the medicine may not reach deeply into the bone. The condition sometimes requires repeated or long-term treatment. The infection is treated with antibiotic injections, followed by antibiotics taken by mouth. </p><p>Surgery to remove part of the bone and drain the mastoid (<a test="test" href="./003016.htm">mastoidectomy</a>) may be needed if antibiotic treatment does not work. Surgery to drain the middle ear through the eardrum (<a test="test" href="./003015.htm">myringotomy</a>) may be needed to treat the middle ear infection.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Outlook (Prognosis)</h2></div><div class="section-button"><button type="submit" aria-controls="section-5" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-5"><p>Mastoiditis can be cured. However, it may be hard to treat and may come back.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Possible Complications</h2></div><div class="section-button"><button type="submit" aria-controls="section-6" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-6"><p>Complications may include:</p><ul><li>Destruction of the mastoid bone</li><li><a test="test" href="./003093.htm">Dizziness</a> or vertigo</li><li><a test="test" href="./001416.htm">Epidural abscess</a></li><li><a test="test" href="./003028.htm">Facial paralysis</a></li><li><a test="test" href="./000680.htm">Meningitis</a></li><li>Partial or complete <a test="test" href="./003044.htm">hearing loss</a></li><li>Spread of infection to the brain or throughout the body</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>When to Contact a Medical Professional</h2></div><div class="section-button"><button type="submit" aria-controls="section-7" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-7"><p>Contact your health care provider if you have symptoms of mastoiditis.</p><p>Also call if:</p><ul><li>You have an <a test="test" href="./001336.htm">ear infection</a> that does not respond to treatment or is followed by new symptoms.</li><li>Your symptoms do not respond to treatment.</li><li>You notice any facial asymmetry.</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Prevention</h2></div><div class="section-button"><button type="submit" aria-controls="section-8" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-8"><p>Prompt and thorough treatment of ear infections reduces the risk for mastoiditis.</p></div></div></section><section><div class="section sec-mb"><div class="section-header"><div class="section-title"><h2>Images</h2></div><div class="section-button"><button type="submit" aria-controls="section-tnails" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/2298t.jpg" alt="Mastoiditis - side view of head" title="Mastoiditis - side view of head" class="side-img"/><a href="../imagepages/2298.htm">Mastoiditis - side view of head</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/2299t.jpg" alt="Mastoiditis - redness and swelling behind ear" title="Mastoiditis - redness and swelling behind ear" class="side-img"/><a href="../imagepages/2299.htm">Mastoiditis - redness and swelling behind ear</a></li>
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<li><img src="//medlineplus.gov/ency/images/ency/tnails/7140t.jpg" alt="Mastoidectomy - series - Normal anatomy" title="Mastoidectomy - series - Normal anatomy" class="side-img"/><a href="../presentations/100032_1.htm">Mastoidectomy - series</a></li>
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</ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>References</h2></div><div class="section-button"><button type="submit" aria-controls="section-Ref" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Ref"><p>Matlock AG, Pfaff JA. Otolaryngology. Matlock AG, In: Walls RM, ed. <em>Rosen's Emergency Medicine: Concepts and Clinical Practice</em>. 10th ed. Philadelphia, PA: Elsevier; 2023:chap 58.</p><p>Pelton SI. Otitis externa, otitis media, and mastoiditis. In: Bennett JE, Dolin R, Blaser MJ, eds. <em>Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases</em>. 9th ed. Philadelphia, PA: Elsevier; 2020:chap 61.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 5/2/2024</h2></div><div class="section-button"><button type="submit" aria-controls="section-version" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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<div id="section-version" class="section-body"><p>Updated by: Josef Shargorodsky, MD, MPH, Johns Hopkins University School of Medicine, Baltimore, MD. Also reviewed by David C. Dugdale, MD, Medical Director, Brenda Conaway, Editorial Director, and the A.D.A.M. Editorial team. </p>
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