What Causes Dysarthria?

Reviewed on 3/26/2021

Dysarthria means slurred speech.
Dysarthria means slurred speech.

Dysarthria means slurred speech. A pathology that causes difficulty moving the muscles in your mouth and face that control speech often cause dysarthria. Brain damage due to a stroke is the leading cause of dysarthria.

Other causes of dysarthria depend on the type of disease. Dysarthria may have its origin in the brain or causes in the muscles (neuromuscular dysarthria).

Causes of dysarthria originating in the brain are as follows:

Neuromuscular diseases also can cause central dysarthria:

Peripheral dysarthria develops from damage to the speech organs that alter a person’s sound. Causes include:

Other causes include:

What are the symptoms of dysarthria?

The symptoms of dysarthria may vary, depending on the underlying medical condition and type of dysarthria. Symptoms include:

  • Slurred speech
  • Slow speech
  • Inability to speak louder than a whisper or speaking too loudly
  • Rapid speech that is difficult to understand
  • Nasal, croaky, or strained voice
  • Uneven or abnormal speech rhythm
  • Uneven speech volume
  • Monotone speech
  • Trouble moving your tongue or facial muscles

What is the treatment for dysarthria?

The treatment depends on the type and severity of the disease. The speech and language pathologists may work on

  • Improving your speech.
  • Strengthening your mouth muscles.
  • Using more breath to speak louder.
  • Moving your lips and tongue more.
  • Using alternative methods of communication such as gestures, writing, or using computers.
  • Saying sounds clearly in words and sentences.


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