may be combined, and progress this way.

Also acute toxin poisoning will affect many nerves.

But the vast majority of PNs remain sensory.

For example poisoning with arsenic affects both systems.

But diabetic neuropathy typically does not. But some people with diabetes progress to autonomic and gastroparesis, when others do not.

So it might be a matter of overwhelming the systems suddenly,
or genetic failure of the nerve cells (something within them
fails and the cells die).

Neuropathies are very complicated. This is why we don't see more progress with their treatment by the medical community.
Each person presents with different symptoms and degree.

From what I have seen, the more aggressive treatments are offered (IVIG and plasmaphariesis) when motor elements become affected.