Lack of movement!!
When you stop the blood flow and then let the blood back into your arm you get pins and needles, it can be caused by learning on it.
Acupuncture. Or maybe you fell asleep on your arm again.
Tingling in the arm is usually paresthesiae, that "pins and needles" feeling one gets when falling asleep on the arm for example. Tingling also can happen in the right arm when Carpal Tunnel Syndrome is present.
It's common. It's caused by odema (swelling, water retention) that put pressure on the nerves that go through the arm and hand. That is what causes pins, needles and pain. See your doctor and get a splint to wear.
Normally, resting the effected arm and using pain killers.
Because you probably keep sleeping on it wrong.
'Pins and needles' are a sensation of uncomfortable tingling or prickling, usually felt in the arms, legs, hands or feet. A common cause is pressure on a specific part of the arm or leg, which causes compression of nerves.
There are 2 different things that could be happening if your son is feeling pins and needles after hitting his shoulder. He could have a dislocated shoulder or he may have a pinched nerve in his shoulder or neck.
It is known as 'Pins and Needles' and is caused by restricting the blood flow in the arm by laying on it when asleep.
Although it mights sound counterintuitive, the best way to get rid of a pins and needles sensation in your hands or feet is to move them around. The sensation is caused by a decrease in bloodflow and movement will restore bloodflow to that area.
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The problem you may be having with the "pins and needles" would be that you have constriction of blood in your arm. Symptoms of constriction would be: 1. Needle like pains 2. Repetative numbness 3. Sharp "shocking" pains in muscle area 4. Cold/Freezing pain in hands and fingers If you are dealing with these problems, you may wish to consult a doctor just to be on the safe side.