Signs and Symptoms of Parkinson’s Disease. Here are the general symptoms of Parkinson’s disease: 1  Slowing of voluntary movements. 2  Decreased facial expression and eye blinking. 3  Monotonous and slurring of speech. 4  Stooped posture and shuffling gait. 5  Unsteadying of balance and having a difficult time rising from a sitting position. 6  Tremors of the hands.