Parkinson's disease (PD) is a progressive neurodegenerative disease that primarily affects the parts of the brain that controls movement, resulting in tremors, stiffness, and slowness. Difficulty walking and loss of balance typically emerge as the disease progresses. Some people may also develop dementia as their PD progresses into the later stages of the disease, often resulting in significant memory loss, difficulty concentrating, thinking, completing routine activities, and navigating in their environment. Behavioural problems are also common including depression, hallucinations and delusions.