[AnnieBL]

I speculate that in many cases PM does not itself cause these various effects, but its mental effects may include alteration of the brain's perception of certain sensory effects. This could explain Sfem's possibly greater perception of pain and numbness characteristic of metatarsalgia, Big Dave's improved sensory perception in his feet, greater awareness of possibly pre-existing low level back aches, and possibly a greater degree of paraesthesia generally - not in all cases a bad thing, but perhaps a price to be paid for other benefits of PM?