Hello, my name is pamela this is my first time using web md, my question is , all of a sudden out of the blue I started with this shaking and weakness in my left leg and hand. In the fall of 2001 I suffured a stroke my left side is still kind of weak from it. in2012 I was diagnosed with lung cancer is it because of these illnesses may be the cause of the shaking or is it the start of Parkinson disease?.