Parkinson’s disease is a progressive neurological disorder that affects movement by causing the damage or death of neurons in the brain region that’s responsible for muscle control.
When assessing Parkinson’s disease, doctors distinguish between two phases: the prodromal and clinical phases. The prodromal phase is characterized by patients noticing symptoms that aren’t yet serious enough to warrant a diagnosis, while the clinical phase comes once symptoms are significant enough to justify testing to diagnose the disease.





