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Parkinson's disease is a progressive neurologic disorder with motor and non-motor effects. Bradykinesia is central to the motor syndrome, which may also include rigidity, rest tremor, and impaired balance. Sleep, mood, autonomic function, pain, cognition, communication, and swallowing can also be affected. Presentation and rate of change vary, so diagnosis and support should not be inferred from tremor or age alone. The NICE guideline for Parkinson's disease in adults covers specialist diagnosis, medication, non-motor symptoms, rehabilitation, communication, swallowing, and AAC.
Quick reference
| Topic | Condition-specific guidance |
|---|---|
| Diagnosis | Clinical diagnosis by an appropriately experienced specialist, with ongoing review |
| Motor features | Slowness of movement with rigidity, rest tremor, or postural instability in varying combinations |
| Non-motor features | May include sleep, mood, autonomic, sensory, cognitive, communication, and swallowing changes |
| Course | Progressive but highly variable; symptoms and function may fluctuate within a day and across medication cycles |
| Communication | Voice, speech, language, cognition, hearing, facial expression, and participation may each contribute |
| AAC | Introduced from current communication needs and anticipated change, with individualized access trials and backup |
Recognition and diagnosis
Possible features include reduced movement speed, smaller movement, rest tremor, stiffness, reduced arm swing, gait change, smaller handwriting, reduced facial movement, soft voice, altered smell, constipation, dream-enactment behavior, depression, or cognitive change. Many are nonspecific, and some people with Parkinson's disease have little or no tremor.
Diagnosis is primarily clinical and should be made by a specialist with expertise in differentiating Parkinson's disease from medication effects, essential tremor, vascular causes, and atypical parkinsonian disorders. Imaging may help answer a focused diagnostic question when uncertainty remains, but it does not replace the history and examination. The diagnosis should be reviewed if early features, response to treatment, or rate of progression are atypical (NICE recommendations).
Treatment and urgent boundaries
Medication choices depend on motor and non-motor symptoms, functional impact, adverse-effect risk, other conditions, and the person's priorities. Medication timing matters: delayed or omitted doses can cause substantial deterioration. Parkinson medicines should be reconciled carefully during admission or a change in care setting, and planned changes should be made with the treating team.
Rehabilitation may involve a Parkinson specialist, nurse, physical and occupational therapy, speech-language pathology, dietetics, pharmacy, mental health, social care, and primary care. Goals may address movement, falls, daily activities, exercise, communication, eating and drinking, cognition, work, relationships, and caregiver support.
Seek emergency assessment for sudden one-sided weakness, facial droop, severe new headache, collapse, breathing difficulty, or inability to swallow. Abrupt confusion, hallucinations, profound sleepiness, fever, a rapid decline in mobility, or repeated choking warrants prompt medical review because infection, medication effects, dehydration, or another acute illness may be responsible rather than routine progression.
Speech, voice, and communication
Speech may become quieter, less distinct, more rapid or variable, or less expressive in pitch and stress. Reduced facial movement can also be misread as disinterest or low mood. The speaker may not perceive the change to the same degree as listeners. Language and cognitive changes can add word-finding, topic maintenance, processing, or conversation difficulties.
Speech-language assessment should consider intelligibility, voice, respiratory support, rate, language, cognition, hearing, fatigue, medication cycle, communication environments, and the person's own goals. Treatment may use calibrated effort, external cueing, rate or intelligibility strategies, partner training, and environmental changes. A named intensive program, amplifier, or exercise is an option to evaluate, not a universal prescription. NICE recommends speech-language therapy when communication, swallowing, or saliva concerns occur (NICE recommendations).
Swallowing and saliva
Possible dysphagia signs include coughing or choking, wet or changed voice, food or pills sticking, food remaining in the mouth, prolonged meals, unplanned weight loss, dehydration, or chest illness. Aspiration can occur without coughing. Drooling often reflects less frequent or less automatic swallowing rather than excess saliva production.
Clinical assessment and, when indicated, instrumental evaluation should guide treatment. Posture, alertness, respiratory health, cognition, oral care, medication timing, food and fluid properties, efficiency, independence, and quality of life should be considered together. Texture modification, exercises, cueing, medication-form changes, and nutrition support require individual assessment; a Parkinson diagnosis alone does not determine a safe strategy. The Parkinson's Foundation speech and swallowing overview provides patient-facing signs and referral information.
Cognition and interaction
Attention, processing speed, executive function, visuospatial skills, memory, or language may change, but the pattern and functional effect vary. Hearing, vision, sleep, mood, medication, pain, and fatigue can compound difficulty. Sudden cognitive change should be treated as a possible acute medical problem rather than presumed dementia.
Support can include one topic at a time, reduced background noise, extra response time, visible agendas, written summaries, and external memory aids selected with the person. Communication partners should address the person directly and confirm meaning without taking over the conversation.
AAC and access planning
AAC may supplement speech in demanding settings or provide an alternative when speech no longer meets the person's needs. Planning before a communication crisis allows the person to choose vocabulary, learn strategies, and train partners. Speech, gesture, writing, alphabet or topic supports, and low-tech boards can remain part of a multimodal plan.
Access should be tested across medication states and fatigue levels. Tremor, bradykinesia, rigidity, vision, posture, cognition, and voice variability may affect performance differently. Touch, adapted keyboards, speech input, switches, eye tracking, and partner-assisted scanning are possibilities to assess, not stage-based defaults. Include health and emergency messages, mounting and charging plans, partner training, and a low-tech backup. See the AAC assessment and acquisition guide and ASHA AAC Practice Portal.
Prognosis and follow-up
Parkinson's disease progresses, but the rate and combination of motor, cognitive, autonomic, communication, and swallowing changes differ among people. Prognostic discussion should be individualized and revisited over time. Communication and swallowing baselines are useful early, with reassessment after a meaningful change, recurrent chest illness, weight loss, medication or surgical treatment change, or transition in care.