Dysarthria: What causes slurred speech?

What causes dysarthria?

- Richard / Arizona

Mayo Clinic neurologist Jerry Swanson, M.D., and colleagues answer select questions from readers.

Answer

Dysarthria refers to slow and distorted speech, such as slurring. It results from the inability to control or coordinate the muscles used in speaking. Common causes of dysarthria include:

Stroke
Traumatic brain injury
Brain tumor
Degenerative disorders such as Parkinson's disease, amyotrophic lateral sclerosis (ALS) and multiple sclerosis
Conditions that cause facial paralysis or weakness, such as Bell's palsy

Another cause of dysarthria is excessive use of alcohol and certain medications, such as sedatives or narcotics.

Treatment of dysarthria is directed at the underlying cause when possible, which may improve speech. Speech therapy often helps people with dysarthria regain normal speech. If dysarthria is caused by prescription medications, talk to your doctor about the possibility of changing or discontinuing such medications.

Because dysarthria can be sign of a serious underlying problem, see your doctor if you experience sudden or unexplained loss of ability to speak clearly.