Researchers speculate that the prevalence of Parkinson's disease among Americans is higher than previously believed.

A recent study shows that Parkinson's disease is a considerably more serious issue, especially among older Americans.

The researchers concluded after analyzing a large amount of data that the annual number of new instances of the degenerative condition diagnosed in North America is almost 50% higher than existing estimates.

According to James Beck, the chief scientific officer at the Parkinson's Foundation and a co-....