Welcome to NeuroTalk.
Have you been to a podiatrist with your foot problems yet?
There are tiny bones under the ball of each foot called sesamoids. They can shatter, crack and/or move around in the
tendons and give alot of pain.
Also people with PN, who have a diabetic link, can develop a condition called Charcot Foot. This is painful and it swells, and
can come from a stress event on the metatarsal bones.
If you search Charcot Foot, you can find many sites discussing it, like this one:
I think all people with foot pain, should have a screening by a good podiatrist to see if a mechanical issue is contributing to a PN state.
People taking certain medications that disrupt calcium and also Vit D, can develop osteopenia, and this can affect the small bones of the foot causing stress fractures.