It is not true that all people with Parkinson's are shaking. In fact, about one in three people with Parkinsonism have little or no tremor. And in those people who suffer from tremor, the degree or the moment (at rest or during use of for example hands) differs greatly. People with a form of Parkinson's disease in which the tremor is more dominant have on average a somewhat more favourable prognosis than people who do not or hardly suffer from tremor. The reason for this is however not yet clear.