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Parkinson’s disease (PD) and Parkinson’s disease with Lewy bodies (PDLB) are two neurological disorders that primarily affect movement and cognition. While they have some similarities, it is critical to understand the differences between them in order to ensure accurate diagnosis and appropriate management. I

Accurate diagnosis is critical for determining the best management strategy. A thorough clinical evaluation, symptom assessment, and imaging techniques can help distinguish between PD and PDLB. It should be noted, however, that a definitive diagnosis of PDLB can only be confirmed through post-mortem examination.

  1. Parkinson’s Disease: Unraveling the Basics

Parkinson’s disease, also known as PD, is a chronic and progressive nervous system disorder. It primarily affects the brain’s movement control centres, resulting in tremors, rigidity, bradykinesia (slowed movement), and postural instability. Parkinson’s disease is characterised by the loss of dopamine-producing cells in the substantia nigra, a brain region. Although the exact cause of Parkinson’s disease is unknown, genetic and environmental factors are thought to play a role.

  1. Parkinson’s Disease with Lewy Bodies: A Closer Look

Parkinson’s disease with Lewy bodies (PDLB) is a type of Parkinsonism that resembles PD in many ways. However, PDLB is distinguished by the presence of abnormal protein clumps in the brain known as Lewy bodies. These Lewy bodies are primarily made up of alpha-synuclein, a protein that builds up and disrupts normal brain function. Individuals with PDLB frequently experience cognitive impairment, visual hallucinations, and fluctuations in attention and alertness, in addition to movement symptoms.

  1. Differentiating Symptoms: Motor and Non-Motor Features

Motor Symptoms:

  • Tremors: Both PD and PDLB are characterised by resting tremors, which are most noticeable at rest and diminish during voluntary movement.
  • Rigidity: Both conditions are characterised by stiffness and muscle rigidity, making it difficult to initiate and maintain smooth movements.
  • Bradykinesia: Bradykinesia is characterised by slowed movement, whereas PDLB may exhibit additional rapid and unpredictable movement changes.
  • Balance issues and a higher risk of falling are common in both PD and PDLB due to impaired postural reflexes.

Non-Motor Symptoms:

  • Cognitive Impairment: When compared to PD, PDLB is associated with more pronounced cognitive deficits, such as memory problems, executive dysfunction, and confusion.
  • Visual hallucinations are more common in PDLB and can be an early symptom, with vivid and detailed visions.
  • Attention Fluctuations: PDLB can have fluctuations in alertness and attention throughout the day, whereas PD has more stable cognitive function.
  1. Diagnosis and Treatment Approaches


  • Clinical Evaluation: A medical history, physical examination, and assessment of motor and non-motor symptoms aid in the diagnosis of both Parkinson’s disease and Parkinson’s disease-like behaviour.
  • Imaging Techniques: Brain imaging, such as MRI or PET scans, can help visualise changes associated with Parkinson’s disease and Parkinson’s disease-like behaviour, assisting in the diagnostic process.
  • Post-mortem examination, which detects the presence of Lewy bodies, is the only way to confirm a definitive diagnosis of PDLB..


  • Medications: Medications aimed at increasing dopamine levels in the brain to alleviate motor symptoms are the primary treatment for both PD and PDLB.
  • Physical and Occupational Therapy: Rehabilitation techniques aid in the management of movement difficulties and the improvement of daily functioning.
  • Non-motor symptoms, such as cognitive impairment and psychiatric manifestations, necessitate a multifaceted approach involving carers, therapists, and healthcare professionals.


To summarise, while Parkinson’s disease and Parkinson’s disease with Lewy bodies share motor symptoms, they have distinct features that distinguish them. PDLB is distinguished by the presence of Lewy bodies and is frequently associated with significant cognitive impairment and non-motor symptoms. Accurate diagnosis and management are critical for improving treatment outcomes and the well-being of people living with these conditions. Healthcare professionals can provide tailored care and support to patients and their families by understanding the differences between PD and PDLB.