Do I have Parkinson's disease or Essential Tremor? How can I tell the difference clinically? 

Moving fast with Parkinson’s that’s the name of your video. Oh my God.

Amazing explanation!

Best explanation (and demonstration) of the differences between them that I’ve seen. Thank you.

Thanks,Doctor. Your explanation helped me greatly. I started with ataxia , next came one sided kinetic tremor pulsing around left thumb . Now chattering at rest. Motion disorder neurologist scripted levodopa and I was sick in my stomach and in bed for 3 days. Not looking for any opinion, just wanted to say thanks for clarifying differences.

But what about EARLY onset? I am 36 and have tremor in my left hand, especially when my muscles in my left hand or arm are contracted

I've seen an intention tremor with a PD dx