What Causes Pins and Needles?

Ever wondered what causes that strange tingling feeling? Well, settle in as Quick Questions explains how it works. Just be careful how you sit.

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Sources:
http://www.ninds.nih.gov/disorders/paresthesia/paresthesia.htm

http://mentalfloss.com/article/21035/why-do-limbs-fall-asleep

http://www.livescience.com/33727-pins-needles-sensation.html

http://www.ncbi.nlm.nih.gov/pubmed/20592403

http://www.betterhealth.vic.gov.au/bhcv2/bhcarticles.nsf/pages/Pins_and_needles

http://www.nhs.uk/conditions/Pins-and-needles/Pages/Introduction.aspx