Neuropathy
Neuropathy of the feet or legs is a pretty rare, but very serious issue (which is why we are adding it to our list.) It's a loss of feeling due to dysfunction of your nervous system. It can be stemmed from spinal injury or brain damage. The causes of this are fairly obvious and I'm sure I could list a million ways where this could result. It's important that you recognize that if you get hurt doing anything and you cant feel one of your body parts or can move them but lack feeling, you need to stay still as your spine or head my be severely damaged.
Treatment
Your doctor will provide you with any treatment or relief possible.