fig1

Figure 1. Venn diagram demonstrating the relationship between essential tremor and ageing with respect to clinical features, cerebellar pathology, parkinsonism, and dementia. Older age is both associated with a more severe phenotype of essential tremor (likely due to a combination of progression with time as well as age and age-related processes), higher prevalence, higher chance of meeting criteria for essential tremor plus, and a higher rate of co-morbid parkinsonism/Parkinson´s disease and dementia. However, there is limited evidence that essential tremor increases the risk of degenerative disorders (e.g., dementia, Parkinson´s disease) in carefully controlled populations. Pathological features of essential tremor do not seem to correlate with tremor severity or duration.