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Speech helps us express our thoughts, needs and emotions. So, when a person suddenly starts speaking unclearly, slowly or with a “drunken” sound, it can be frightening for both the person and their family.
This condition is commonly known as slurred speech. The medical term for speech affected by weak or poorly controlled speech muscles is dysarthria. It may occur because of a problem in the brain, nerves, muscles, throat or the medicines a person is taking.
Dysarthria is not a disease by itself. It is usually a symptom of another health condition. In some cases, it develops gradually. However, sudden slurred speech can be a warning sign of stroke and requires immediate medical attention.
Call your local emergency service immediately if slurred speech starts suddenly, especially when it occurs with:
Remember the FAST warning signs of stroke:
Stroke symptoms may improve after a few minutes, but this does not mean the danger has passed. A temporary episode may be a transient ischaemic attack, also called a TIA, which can warn of a future stroke. The NHS stroke guidance recommends urgent medical help even if the symptoms have stopped.
Dysarthria is a motor speech disorder. It occurs when the muscles used for speaking become weak, stiff, slow or difficult to control. These muscles include the lips, tongue, jaw, soft palate, voice box and breathing muscles.
A person with dysarthria may know exactly what they want to say, but their speech may not sound clear. Their language and understanding can remain normal, although dysarthria may occur together with other communication problems.
Dysarthria is different from aphasia. In aphasia, a person may have difficulty understanding language, finding the right words or forming sentences. In dysarthria, the main problem is the physical production of speech. However, both conditions can occur after a stroke or brain injury.
The symptoms of dysarthria vary depending on its cause and severity. Speech may be mildly unclear or very difficult to understand.
Common dysarthria symptoms include:
Some people notice that their speech is clearer in the morning but becomes less understandable later in the day. Others may have symptoms that come and go. The pattern and timing of symptoms can help a doctor identify the possible cause.
There are many possible slurred speech causes. Some need emergency treatment, while others may be linked to long-term neurological or muscular conditions.
1. Stroke or Transient Ischaemic Attack
Stroke is one of the most important causes of sudden dysarthria. It happens when blood flow to part of the brain is blocked or when a blood vessel in the brain bleeds.
Speech changes may occur with facial weakness, arm weakness, confusion or difficulty walking. Even if speech returns to normal, immediate medical evaluation is necessary.
2. Head Injury
A serious head injury can affect the parts of the brain or nerves that control speech. Slurred speech after a fall, accident or blow to the head should not be ignored, particularly if it occurs with vomiting, drowsiness, unequal pupils, weakness or worsening headache.
3. Neurological Conditions
Dysarthria may occur in conditions that affect the brain, spinal cord, nerves or muscles. These may include:
4. Medicines, Alcohol or Other Substances
Some medicines can affect alertness, muscle control or coordination. Medicines used for seizures, pain, anxiety or sleep may sometimes contribute to slurred speech. Alcohol and certain recreational drugs can also cause temporary speech changes.
Never stop a prescribed medicine without speaking to your doctor. A healthcare professional may review the dose, timing or combination of medicines.
5. Low Blood Sugar or Other Metabolic Problems
Severe changes in blood glucose, electrolytes, liver function or other body processes can affect brain function and speech. This is more likely in people with diabetes, serious infections, kidney or liver disease, or those taking multiple medicines.
Blood tests may help identify these problems when a doctor considers them possible.
6. Facial, Mouth or Throat Problems
Speech may become unclear when the structures involved in speaking are affected. Examples include facial paralysis, tongue or throat weakness, oral surgery, poorly fitting dentures and certain voice box conditions.
These problems may not always originate in the brain, but they can still interfere with clear pronunciation.
A doctor will first ask when the speech problem began and whether it developed suddenly or gradually. This difference is important because sudden onset may suggest stroke or another urgent condition.
The doctor may ask about:
A neurological examination may check facial movement, tongue strength, reflexes, coordination, balance and limb strength. A speech-language pathologist may assess pronunciation, breathing, voice quality, speech speed and how easily others understand the person.
Depending on the suspected cause, tests may include:
Not every person needs every test. The doctor chooses investigations according to the symptoms, examination findings and medical history.
People often search for “slurred speech ICD 10” when reading a medical bill, report or insurance document.
In the United States ICD-10-CM system:
These are symptom or speech-related codes. The underlying condition, such as stroke, Parkinson’s disease, medication effects or head injury, may require a separate diagnosis code. Coding systems can vary by country, so the final code should be assigned by the treating doctor or qualified medical coder.
The Centers for Medicare & Medicaid Services coding reference lists R47.81 for slurred speech and R47.1 for dysarthria and anarthria.
Dysarthria treatment depends on the underlying cause, the severity of the speech problem and whether swallowing is also affected.
Treating the Underlying Cause
The first step is to identify and manage the condition responsible for dysarthria. Treatment may include emergency stroke care, management of blood sugar, treatment for infection, adjustment of medicines or care for a neurological condition.
For example, dysarthria caused by a medicine may improve after a doctor changes the medicine. Speech changes linked to stroke may improve during rehabilitation, while progressive neurological conditions may require long-term support.
Speech and Language Therapy
Speech and language therapy is a central part of dysarthria treatment. Therapy may focus on:
Communication Aids
If speech remains difficult to understand, a person may benefit from:
Using an aid is not a sign of failure. It is a practical way to stay independent and communicate with less frustration.
Swallowing Support
Dysarthria may occur with swallowing problems. Coughing during meals, a wet or gurgly voice after drinking, repeated choking or unexplained weight loss should be reported to a doctor.
A speech-language pathologist may recommend a swallowing assessment and safe eating strategies. Do not change food thickness or avoid important food groups without professional guidance.
Communication can become stressful when a person is repeatedly asked to repeat themselves. Small changes can make conversations easier:
Dysarthria can affect confidence, work and social relationships. Patience and respectful communication are important parts of recovery.
Dysarthria itself cannot always be prevented because some causes are genetic, accidental or progressive. However, reducing the risk of stroke and other neurological complications can help.
Important preventive steps include:
A doctor may recommend blood tests to look for metabolic, nutritional, infectious or organ-related problems that could contribute to speech changes. The exact tests depend on the person’s symptoms and medical history.
After receiving a prescription, patients can use Pathkind Labs for recommended diagnostic testing and check the availability of nearby centres or home sample collection services. However, laboratory testing should never delay emergency hospital care when slurred speech begins suddenly.
Dysarthria can make speech sound slurred, slow, soft or difficult to understand. It may result from a temporary problem, medication effect, neurological condition, head injury or stroke.
The most important point is timing. Sudden slurred speech, especially with facial drooping, arm weakness, confusion or balance problems, is an emergency. Do not wait for it to improve.
For gradual or recurring speech changes, consult a healthcare professional. With the right diagnosis, treatment of the underlying cause, speech therapy and family support, many people can communicate more safely and confidently.
Medical disclaimer: This article is intended for general health awareness and does not replace examination, diagnosis or treatment by a qualified healthcare professional.
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