Proper Parkinson’s disease diagnosis is difficult, particularly in the early stages. For many people it takes years before they are accurately diagnosed. The fact that symptoms and progression of symptoms varies between individuals adds to the complexity of diagnosing Parkinson’s disease.

Symptoms of Parkinson’s disease include motor and non-motor features. Each person with Parkinson’s experiences the disease differently. While tremors are a common primary symptom, not all people with PD have tremors. Additionally, symptoms and disease progress at different rates between individuals.