Scientists at the University of Sydney's Brain and Mind Institute believe there are earlier indicators such as mood changes, loss of the sense of smell, constipation and a condition known as Rapid Eye Movement Sleep Behaviour Disorder.
However, they may not be the early indicators of this debilitating neurological condition.
Simply put, this is when a person starts "acting out" in their dreams, kicking or punching the person sharing their bed.
A person with Parkinson's disease lacks the dopamine that inhibits this behaviour during sleep, and as such researchers think it's an early indicator of the condition.
Drive presenter Kelly Higgins-Devine spoke with Dr Simon Lewis, Neurologist and Senior lecturer in Cognitive Neuroscience about these early warning signs.