Parkinson's disease must be differentiated from other conditions, especially those presenting with tremor. Remember that parkinsonism refers to any condition that causes a combination of the movement abnormalities seen in PD—such as tremors, slow movement, impaired speech, or muscle stiffness—resulting from the loss of dopamine-containing neurons. Not everyone who has parkinsonism has Parkinson's disease.
Other diagnoses that you should consider:
Click here for a differential diagnosis table with information on these eight conditions.