PD is a movement disorder, our neurotransmittors do not send the
signal correctly
example - you automatically when healthy can take a step,
the foot should pick up - not in PD and in Multiple Sclerosis,
and other neurodegenerative illness,
you want to take that step, but we short cicuit, and we freeze, loss of movement.
it is actually called - akinesia
when Parkies cant stop moving, tremor or uncontrollable movement,
it is called dyskinesia...
I have had abit of both - neither is fun or funny...
the last is dystonia - just as painful as childbirth,
I will tell you, they do need an absolute test for PD, because of the
variations of symptomology...
I hope I answered your question; my first symptoms were tremoring hands.
peace to your heart,
tena