: Does a Parkinson's Disease always reach the final stage 5 There are five stages of Parkinson's Disease (according to https://parkinsonsnewstoday.com/parkinsons-stages/ for instance) Are there exceptions or do patients always

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Parkinson's is a progressive disease 1, so in general it's going to progress through all the stages eventually for most patients, but there are very few things in medicine you can say "always" happen (except maybe that exceptions always happen).

Although Parkinson’s disease (PD) is progressive and worsens over
time, it is highly individual and affects people differently. Not all
people who have PD will experience all the symptoms, and symptoms may
vary in their severity between patients. Different people experience
progression at different speeds, as well.

So the answer to your basic question is no, stage 5 is not a guaranteed outcome for every patient who lives long enough. It is, however, a likely outcome.