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</a><h1 class="with-also" itemprop="name">Focal neurologic deficits</h1>
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</noscript></div><div class="main"><div id="ency_summary"><p>A focal <a test="test" href="./002267.htm">neurologic deficit</a> is a problem with nerve, spinal cord, or brain function. It affects a specific location, such as the left side of the face, right arm, or even a small area such as the tongue. Speech, vision, and hearing problems are also considered focal neurological deficits.</p><p>The type, location, and severity of the problem can indicate which area of the brain or nervous system is affected.</p><p>In contrast, a non-focal problem is NOT specific to a certain area of the brain. It may include a general <a test="test" href="./003202.htm">loss of consciousness</a> or emotional problem.</p></div><section><div class="section"><div class="section-header"><div class="section-title"><h2>Considerations</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>A focal neurologic problem can affect any of these functions:</p><ul><li>Movement changes, including paralysis, <a test="test" href="./003174.htm">weakness</a>, loss of muscle control, increased muscle tone, <a test="test" href="./003298.htm">loss of muscle tone</a>, or movements a person cannot control (involuntary movements, such as tremor)</li><li>Sensation changes, including <a test="test" href="./003206.htm">paresthesia</a> (abnormal sensations), numbness, or decreases in sensation </li></ul><p>Other examples of focal loss of function include:</p><ul><li><a test="test" href="./000708.htm">Horner syndrome</a>: small pupil on one side, one-sided <a test="test" href="./003035.htm">eyelid drooping</a>, lack of sweating on one side of the face, and sinking of one eye into its socket</li><li>Not paying attention to your surroundings or a part of the body (neglect)</li><li><a test="test" href="./003198.htm">Loss of coordination</a> or loss of <a test="test" href="./002364.htm">fine motor control</a> (ability to perform complex movements)</li><li>Poor gag reflex, swallowing difficulty, and frequent choking</li><li>Speech or language difficulties, such as aphasia (a problem understanding or producing words) or dysarthria (a problem making the sounds of words), poor enunciation, poor understanding of speech, difficulty writing, lack of ability to read or understand writing, inability to name objects (anomia)</li><li><a test="test" href="./003029.htm">Vision changes</a>, such as reduced vision, decreased <a test="test" href="./003879.htm">visual field</a>, sudden vision loss, double vision (diplopia) </li></ul></div></div></section><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-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>Anything that damages or disrupts any part of the nervous system can cause a focal neurologic deficit. Examples include:</p><ul><li>Abnormal blood vessels (vascular malformation)</li><li><a test="test" href="./000768.htm">Brain tumor</a></li><li><a test="test" href="./000716.htm">Cerebral palsy</a></li><li>Degenerative nerve illness (such as multiple sclerosis)</li><li>Disorders of a single nerve or nerve group (for example, <a test="test" href="./000433.htm">carpal tunnel syndrome</a>)</li><li>Infection of the brain (such as meningitis or encephalitis)</li><li>Injury</li><li><a test="test" href="./000726.htm">Stroke</a></li><li>Transient ischemic attack (TIA)</li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Home Care</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>Home care depends on the type and cause of the problem.</p></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-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>If you have any loss of movement, sensation, or function, contact your health care provider.</p></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>What to Expect at Your Office Visit</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>Your provider will take your medical history and perform a physical examination.</p><p>The physical examination will include a detailed examination of your nervous system function.</p><p>Which tests are done depends on your other symptoms and the possible cause of the nerve function loss. Tests are used to try to locate the part of the nervous system that is involved. Common examples are:</p><ul><li><a test="test" href="./003330.htm">CT scan</a> of the back, neck, or head</li><li><a test="test" href="./003929.htm">Electromyogram</a> (EMG), <a test="test" href="./003927.htm">nerve conduction velocities</a> (NCV)</li><li><a test="test" href="./003335.htm">MRI</a> of the back, neck, or head</li><li><a test="test" href="./003428.htm">Spinal tap</a></li></ul></div></div></section><section><div class="section"><div class="section-header"><div class="section-title"><h2>Alternative Names</h2></div><div class="section-button"><button type="submit" aria-controls="section-Alt" role="button" title="Expand/Collapse section"><span class="icon icon-section-action">
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</div></div><div class="section-body" id="section-Alt"><p>Neurological deficits - focal</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/1074t.jpg" alt="Brain" title="Brain" class="side-img"/><a href="../imagepages/1074.htm">Brain</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>Deluca GC, Griggs RC. Approach to the patient with neurologic disease. In: Goldman L, Schafer AI, eds. <em>Goldman-Cecil Medicine</em>. 26th ed. Philadelphia, PA: Elsevier; 2020:chap 368.</p><p>Jankovic J, Mazziotta JC, Newman NJ, Pomeroy SL. Diagnosis of neurological disease. In: Jankovic J, Mazziotta JC, Pomeroy SL, Newman NJ, eds. <em>Bradley and Daroff's Neurology in Clinical Practice</em>. 8th ed. Philadelphia, PA: Elsevier; 2022:chap 1.</p></div></div></section>
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<section><div class="section"><div class="section-header"><div class="section-title"><h2>Review Date 11/2/2022</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: Evelyn O. Berman, MD, Assistant Professor of Neurology and Pediatrics at University of Rochester, Rochester, NY. Review provided by VeriMed Healthcare Network. 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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