By MONICA RUEHLING, Senior Life columnist
The key signs may start slowly at first: tremors and shaking of limbs, slowness of movement, rigidity or stiffness and poor balance. More symptoms, such as stiff facial expressions, muffled speech, shuffling walk or gait, could follow as the disease progresses.
It could take months or years to present itself; suddently it can seem better or worse. What is this and can a functional life be had?