Parkinson's Disease, Speech, Voice and Swallowing: How Speech Pathology Can Help
Parkinson's disease is a progressive neurological condition that affects movement throughout the body—including the complex muscles responsible for speaking, swallowing and facial expression. While tremor, stiffness and changes in walking are widely recognised symptoms, communication and swallowing difficulties are also common and can have a significant impact on everyday life.
Speech and voice changes affect up to 90% of people with Parkinson's disease during the course of the condition, while swallowing difficulties (dysphagia) also become increasingly common as the disease progresses. These changes can affect communication, nutrition, hydration, respiratory health and social participation, making speech pathology an important component of multidisciplinary Parkinson's care.
How Does Parkinson's Disease Affect Speech?
Speech changes often develop gradually and may not be obvious to the person experiencing them. Family members are frequently the first to notice that a loved one's voice has become quieter or more difficult to understand.
Common speech and voice changes include:
Reduced vocal loudness (hypophonia)
Hoarse or breathy voice quality
Monotone speech with reduced vocal expression
Imprecise articulation (slurred speech)
Speaking too quickly or "rushing" words
Reduced facial expression (masked face)
Difficulty being understood, particularly in noisy environments
One of the hallmark features of Parkinson's disease is reduced awareness of speech changes. Many people feel they are speaking at a normal volume, even though listeners perceive their voice as much quieter.
Swallowing Difficulties (Dysphagia) in Parkinson's Disease
Swallowing difficulties can occur at any stage of Parkinson's disease and often become more noticeable over time. Early assessment is important, as swallowing problems may increase the risk of dehydration, malnutrition and aspiration pneumonia.
Signs of dysphagia include:
Coughing or choking during meals or drinks
Food sticking in the throat
Difficulty swallowing tablets
Needing multiple swallows to clear food
Unexplained weight loss
Recurrent chest infections
Taking significantly longer to finish meals
Some people with Parkinson's disease may have reduced awareness of swallowing difficulties or may attribute changes to normal ageing. Regular assessment by a speech pathologist can help identify problems early and reduce the risk of complications such as aspiration, malnutrition and dehydration.
Speech Pathology Assessment for Parkinson's Disease
Speech pathologists assess both communication and swallowing to identify changes that may affect safety, independence and quality of life.
Assessment may include evaluation of:
Voice quality and vocal loudness
Speech clarity and intelligibility
Communication effectiveness
Swallowing function
Mealtime safety
Functional impact on daily life
Where swallowing concerns are identified, a Videofluoroscopic Swallow Study (VFSS) may be recommended. This specialised X-ray assessment provides a dynamic view of swallowing, allowing the speech pathologist to identify aspiration risk, understand the underlying physiology of swallowing difficulties and develop an evidence-based management plan. It can also determine whether specific swallowing strategies or rehabilitation exercises improve swallowing safety and efficiency.
Speech Therapy for Parkinson's Disease
Speech pathology intervention is individualised according to each person's symptoms, goals and stage of Parkinson's disease.
Treatment may include:
Voice therapy to improve loudness and vocal quality
LSVT LOUD® therapy where appropriate
Strategies to improve speech intelligibility
Swallowing rehabilitation exercises
Home exercise programmes
Communication strategies for everyday conversations
Education and training for family members and carers
The primary goals of therapy are to maintain effective communication, optimise swallowing safety and support participation in everyday activities. As Parkinson's disease progresses, regular review ensures treatment continues to meet changing needs.
When Should You See a Speech Pathologist?
Many people wait until speech or swallowing problems become significant before seeking help. However, early assessment is recommended, ideally soon after diagnosis.
An early assessment provides:
A baseline for future comparison
Early identification of subtle communication or swallowing changes
Education about what to expect
Strategies to help maintain communication and swallowing function
Timely intervention before symptoms significantly affect daily life
Referral to a speech pathologist is appropriate whenever there are concerns about speech, voice or swallowing, or when changes are noticed by family members or healthcare professionals.
Looking for a Speech Pathologist for Parkinson's Disease?
At Adult Speech and Swallow Clinic, we provide comprehensive assessment and evidence-based management of communication and swallowing disorders associated with Parkinson's disease. We work collaboratively with neurologists, geriatricians, general practitioners and other allied health professionals to support people living with Parkinson's at every stage of their condition.
References
Parkinson's Foundation. Speech & Swallowing Issues in Parkinson's Disease.
Available from: https://www.parkinson.org/understanding-parkinsons/non-movement-symptoms/speech-swallowing
Parkinson's Foundation. Speech & Swallowing in Parkinson’s: Fact Sheet.
Available from: https://www.parkinson.org/library/fact-sheets/speech-swallowing
Parkinson's Australia. Speech Pathologist.
Available from: https://www.parkinsons.org.au/information-hub/speech-pathologist/
Parkinson's Australia. Dysphagia (Swallowing Difficulties).
Available from: https://www.parkinsons.org.au/information-hub/swallowing/
Kalf, H. G., de Swart, B. J. M., Bonnier-Baars, M., et al. (2011). Guidelines for Speech-Language Therapy in Parkinson’s Disease. ParkinsonNet / Royal Dutch Society for Physical Therapy.
Gandhi, P., & Steele, C. M. (2022). Effectiveness of interventions for dysphagia in Parkinson disease: A systematic review. American Journal of Speech-Language Pathology, 31(1), 463–485.
Ireland, S., Carroll, V., Blanchard, D., & Rossiter, R. (2022). Recognising and responding to communication and swallowing difficulties in Parkinson’s disease. Australian Journal of General Practice, 51(4), 220–225.
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