Which features characterize Stage 1 Parkinson's disease?

• A. Mild symptoms with unilateral signs
• B. Mild symptoms with bilateral/midline signs
• C. Moderate symptoms with loss of balance
• D. Severe symptoms with inability to live independently

Answer: (A)

Stage 1 is characterized by symptoms that are confined to one side of the body with only mild impact on function. In Parkinson’s, this unilateral onset—often including tremor or stiffness isolated to one limb—means balance and daily activities are typically preserved at this early stage. As the disease progresses, signs spread to the other side (bilateral or midline involvement) and balance impairment may emerge, which is why the description with unilateral signs best fits Stage 1. The other options describe more advanced stages where symptoms are bilateral, involve balance problems, or lead to greater disability.