premise: Parkinson's disease causes tremors.
hypothesis: Parkinson's disease . Early in the disease , the most obvious are shaking , rigidity , slowness of movement , and difficulty with walking . The main motor symptoms are collectively called `` parkinsonism '' , or a `` parkinsonian syndrome '' . The disease is named after the English doctor James Parkinson , who published the first detailed description in An Essay on the Shaking Palsy , in 1817 .