Paresthesia

Paresthesia (pron. ; paraesthesia in British English, pron. ) is a feeling of tingling, prickling, or numbness with no permanent effects. It is commonly called "pins and needles". This feeling may last a short while, or may be more long-lasting. A long-term effect means there is something wrong with neurons in the body.
An example of this can be felt when sitting cross-legged for a long time and your foot "falls asleep". The tingling feeling you get when you move is paresthesia.
Causes.
Paresthesia has many known causes, including the following: