While excess manganese exposure can produce neurological symptoms similar to those of Parkinson’s
disease, there are important differences between the two conditions: for example, Parkinson’s is associated
with a persistent, resting tremor, whereas manganism is associated with an intentional or kinetic tremor.
Blood pressure is also significantly higher in chronic manganese exposure than in Parkinson’s and there are
other pathological differences between the two conditions [13]. However, exposure to excess manganese
(or copper) is thought to increase the risk of developing Parkinson’s disease