Well pins and needles are caused from the lack of blood travelling to and from the body. for example if you put an elastic band around your wrist, eventually you will get pins and needle, because the blood doesnt travel to your hand due to the elastic blocking the veins. Pherhaps you get pins and needles on your tongue, because blood doesnt travel properly to it.
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Temporary Pins and Needles is caused when pressure is applied to the nerves in a certain area (usually legs and arms but in this case hands) - you've leaned on this area or something- so this limits the blood supply to the nerves and stops the nerves sending important messages to the brain.
Pins and needles (numbness) on your head can be related to several conditions and the best thing to do would be to see a doctor. The cause of this varies, but it is a sensory nerve experience.
Pins & Needles or the tingling feeling in your feet hands arms or legs that you get when you have been sitting in one place for a long time is caused by 1. Blood circulation speeding up & 2. pressure on nerves being relieved.
Permanent pins & needles can have many causes but a compressed nerve is often the most common cause, a nerve conduction test will confirm or rule out a condition like that.