Because I tremor very little; however, have many other symptoms it has been a challenge to get a good diagnoses until recently. It is a quandary for the neurologist and myself. My 1st doc for 5 years diagnosed me with Parkinsonism and treated me with Ritalin which helps the dopamine respond through the neuro transmitter norpinhirine. He said there were other meds, like carbo/levo, but wanted to wait because those lose their effectiveness over time. I felt much better on a low dose of Ritalin until I develop a rash and he retired. So was on another doc trek with doc saying I looked healthy so he did not think I was ill!! What does PD look like? Because of lack of tremors I told one doc you don't get it. Found another good doctor this year. Symptoms keep increasing. I have deep fatigue, hard to stand up and get out of car due to extreme stiffness, pains in back of knees and legs. Anxiety in crowds and a lot of other strange symptoms. Now am taking carbo/levo with new neuro which is very helpful with walking a little longer distance. New doc is seeing difference with my gait. We so need a blood test for those who do not have a lot of outward symptoms so the doc can better diagnose. All I know is how I feel and am sooo greatful for carbo/levo able to walk better and less pains.