This sensation seems to have many possible causes. According to eHow.com, posture, position, mineral imbalances, artery disease, nerve damage and Diabetes are some of the causes. Healthline.com also lists a lot of conditions that have the "pins and needles" sensation as a symptom. I will include both links for you below.
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The one that feels like they are hopping on it and does not hurt?
unusual blood movement such as settling, or pressure cutting off circulation such as sitting on your hand. Your hand is asleep, or you've been rubbing your arm. It is an oddly received electrical dendrite to nerve motion because of the pressure or settling on or of your blood.
When you cut off circulation in your arms or legs, your hand gets numb due to the lack of blood. When you let blood go back into your arm or leg, the reaction feels like pins and needles are gently pressing against the area. This is also known as an arm or leg falling asleep.
Say you were sitting down. When you go to get up, your foot has 'fallen asleep' and you get 'pins and needles.'
What really happens is you have blocked off the veins, and the area cannot get enough blood supply. When you re-open the veins, this feeling occurs from the blood attempting to re-supply the area quickly.
The cause for pins and needles in the hands is a symptom of carpal tunnel syndrome. It can cause pain in the hands and loss of grip.
Pins and needles have got nothing to do with poor circulation.
It is caused when one part of the body is compressed. Numbness will give way to the famous tingling sensation.
to get rid of pins and needles you must walk around on that foot and do this for 30 seconds and if that doesnt work then rub your foot. (This really works!!)
your blood goes through your finger and your finger starts tinkling and then you get pins and needles in your finger tips.