Bradykinesia, slowness in voluntary movement that causes difficulty initiating movement as well as difficulty completing movements once in progress. Bradykinesia is the result of the delayed transmission of signals from the brain to the skeletal muscles due to diminished dopamine.
Tremors in the hands, fingers, forearm, or foot that typically occur when the limb is at rest but not when performing tasks. Tremor may occur in the mouth and chin as well.
Rigidity or stiff muscles may produce muscle pain and an expressionless, mask-like face. Rigidity tends to increase during movement.
Poor balance caused by the impairment or loss of the reflexes that adjust posture in order to maintain balance. Consequently, falls are common in Parkinson's patients.
The progressive loss of voluntary and involuntary muscle control produces a number of secondary “Non Motor” symptoms associated with Parkinson's. Most patients do not experience all of them, and symptoms vary in intensity from person to person. Some secondary symptoms of Parkinson's disease include the following: